Popcorn Time (the ransomware) follows the standard practice of locking any PC it manages to infect and demanding payment to unlock it. However, there's a second option to tempt victims and save them some cash. Instead of paying the ransom, a user can attempt to infect other PCs, which the ransomware refers to as "The nasty way" of getting your files back.
http://au.pcmag.com/software/45344/news/ransomware-offers-victims-free-decryption-for-infecting-thei