Google Chrome users may be tricked into downloading malware masquerading as a fix for corrupted fonts. Hackers have been breaking into insecure websites and inserting JavaScript that waits for Chrome browsers to be referred to the sites via search engines. The script then inserts unrecognized characters that break the font rendering on the webpage, which makes all text unreadable. The font in this case is actually click-fraud adware, which loads hidden ads and clicks on them automatically, lining the pockets of those responsible for that malware.”]
Source: http://securityaffairs.co/wordpress/55611/hacking/browser-user-interface-threats.html