U.S. investigators say an announcement pinning the blame on hackers working for the Pyongyang regime could come as soon as Thursday.
Because of the North Korean regime's tight control of the Internet in the reclusive country, U.S. officials believe the hack was ordered directly by the country's leadership.
North Korea experts say the country has spent scarce resources on building up a unit called "Bureau 121" to carry out cyber attacks.
Earlier Wednesday, Sony pulled the film, which depicts the assassination of North Korea's leader, following a threat that people should avoid going to theaters where "The Interview" is playing.
The country's major theater companies had said they had decided to postpone or cancel next week's showing.
"In light of the decision by the majority of our exhibitors not to show the film "The Interview," we have decided not to move forward with the planned December 25 theatrical release," Sony said in its first statement on the matter.
If the deal is approved, the combined group will be the country's dominant provider of television channels and Internet connections, reaching roughly one in three American homes.
"This isn't about TV anymore - it's about controlling a fatter, more intelligent pipe for multiple services that emanate from it," including broadband Internet, phone and home security monitoring, said Tim Hanlon, the founder of the Vertere Group, an investment advisory firm that focuses on media and technology.