Ask HN: Reporting Google Docs spam/abuse without Google account?

Does anyone know how to report Google Docs abuse without a Google account?

I'm getting spammed by having spam Google Docs being shared with me - the email itself comes from Google and is thus legit and makes its way past spam filters. The spam content is in the doc itself.

The usual "report abuse" option takes me to a Google login page to which I don't have an account (and don't want one).

Does anyone know a workaround?