Go to Google Drive and locate the PDF you want to redact. Do not double-click the file to open it; instead, right-click the file and select Open With > Google Docs. 

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One thing to keep in mind: this will open the PDF as a Google document. Depending on the complexity of your PDF, it might not survive the transition intact. Unfortunately, this is the only way to redact a PDF in Google Workspaces (without installing a third-party extension like iDox.ai - which can be expensive). If you're using a Google doc, you shouldn't have any issues. 

With the document open, highlight the text you want redacted. This can be tricky in PDFs, because sometimes you can highlight text, and sometimes you can't. Be as accurate as possible here. 

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Next, click Insert > Drawing > New. This will open a pop-up window that lets you create a black box to place over the area to be redacted.

From the pop-up, click the Shapes icon, select Shapes from the drop-down, and then select the square. You can then draw a rectangle that is roughly the size of the information that needs to be redacted. 

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This is where the cumbersome part comes in -- there's no way of seeing how large the redaction block needs to be. Once you've drawn the border of the shape, click the Bucket Fill icon, select black for the color, and then click Save and Close.

If you remembered to first select the text to be redacted, the black rectangle will automatically be placed correctly. If the block is too large, it might displace some of the other text but what you want hidden will be taken care of. 

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If you forgot to highlight the text, this is the frustrating part. You have to move and resize the redaction block so it covers the necessary text. Unfortunately, there's very little accuracy to this. Click and drag the block where you want it, but you'll find that sometimes it doesn't move, or it moves too far or not enough. This also depends on the complexity of your PDF. Because PDFs are far more complex than documents, there can be a lot of trial and error here. Your best bet is to always highlight the text to be redacted first.

Continue adding redaction blocks until you have all the sensitive information hidden from sight. Once finished, click File > Download > PDF Document to save the newly redacted PDF to your desktop.