I have had a similar problem with one of my web sites. In my case, I am fairly certain that it is was a fake traffic based on three things.
#1 - My Adsense CTR for that page was exactly 10%. (That's not very close to my average.)
#2 - None of the visitors went to any other pages.
#3 - Visitors came in six minutes intervals.
What you should do is download and analyze your raw access logs. Look to see if any of the visitors did anything besides visit page abc.html. Also, look at the time intervals between each visit.
Having visitors come exactly six minutes apart from one search engine using the same exact same search phrase for five hours straight is not normal behavior.
Also, make a quick list of 25-50 suspicious IP numbers and try to determine where they are originate from. In my case, I traced many of the IP numbers back to open proxies.