like title, how can we differentiate that? What if a black hat dude use bot to access his own site, then generate a nice report and intend to sell the Ad spot in Advertising forum? Screenshot of pic cant see anything rite?
if it is your site, then you can check your server log to see the bounce rate. if it is some other site you are buying advertising space on, then research the backlinks, alexa traffic rank, etc which will give you some idea about the traffic and whether the site is legid or not