On one of my web sites I've noticed an attempt to access any one of the following 3 pages:
The pages are frequently followed by a long hash key sequence. Often the referring URL is a search from Google.
I've noticed this every now and then (about every two to six months) and Google has always been involved. A search of the web shows that others have seen this but with referring URL's being from Live search as well. Most commentators think that it's a random attack bot. I don't think that it follows that pattern but I'm not discounting this theory.
Today I came up with a new theory based on the pattern I saw. This was someone clicking on the AdSense link on one of the pages and reporting it to Google for "non compliance." So I was wondering if Google now has an automated way of telling web masters that someone has reported one of their pages for non-compliance. This would make sense so that web masters could check their pages to make sure that they are compliant with AdSense.
I haven't been able to find any further info on this theory yet though...