If your default homepage of your browsers is suddenly been changed to being www.Blackhatworld.com and you cannot switch back to your favorite one, most probably your browser is infected with any potentially unwanted program.
“Blackhatworld.com” is a referral spam website that redirects users to low ranked webpages in order to bring traffic. It manipulates with the typical Google Analytics statistics of various targeted websites by infecting them. The referral spam used by Blackhatworld.com is known as “ghost traffic”. This method is being widely used to spread spam and boost the traffic of some targeted webpages. Blackhatworld.com could actually redirect to suspicious websites.
If your browser is affected with Blackhatworld.com referral spam, then follow the quick removal guide.