TrackBack Spam to Google Search

I'm seeing trackback spam now linking to simple Google searches for a single garbled string. I can't figure out what it may be accomplishing, since the search results in nothing. I must wonder if it's just a test hit to confirm that trackback works for my site and index me for later attack.

Does anyone know how these bogus search links may benefit anyone?

Update (12:40pm): I looked at the access logs, and these requests are coming from all over the place, and I see each client hit the permalink, submit a trackback, then hit the permalink again, as if to check that the trackback was accepted. Interesting.

These requests also all come in for the same page, so it may be some weird centrally-controlled bot network.