Odd Google URL requests

Hmm .. odd one this morning.  Checking Google webmaster tools for the sites this morning and noticed 431 pages not found by the crawler.  Ok, some are historical .asp files that we never bothered to move over the .aspx but others are a bit more worrying.  There has been a sudden rash of requests where the “?” and “=” parameter characters have been grunged : article.aspx%3FID%3D89362&lk%3Dnp.  Now this is a straight forward Next and Previous article link so why it got munged ….. a puzzle.  Given over 400 in a few days, I am leaning towards it being a rogue bot scraper copying the content somewhere.  Time to go trawling in the log files.