Follow up #2!
So it's not my blog that has been hacked, but it's possible a feed that I had run was. Here's Google's response: I do not believe it is your old blog that is hacked. This short link will open another blogger site goo.gl/e6ym9J If you look at the blog roll on that page there is a "Fuzzy Tales" listing with a URL from the canon download site. Those blog rolls are usually constructed from a feed of some sort so maybe a feed that you had run that has been hacked? That blog belongs to https://calypsoandzazou.blogspot.com/, one I used to follow but haven't for a long time. I've left a comment for them, asking them to remove the Fuzzy Tales link from their blog roll. I'm not sure that will do the trick, though. And since it wasn't my blog that was hacked, I really don't know if there's anything else I can do.