North Korea's UN mission on Friday denied involvement in a cyber attack on Sony Pictures after the US FBI said it had evidence that Pyongyang was behind the hacking.

"Our country has no relation with the hacker," North Korean political counsellor Kim Song told AFP.

"There is no relation. This is not worth a comment."

Sony Pictures cancelled the release of the film "The Interview," a comedy about a fictional plot to assassinate North Korean leader Kim Jong-Un over the and warnings to movie-goers.

The anonymous hackers invoked the memory of September 11, 2001 in threatening attacks on cinemas screening the film, prompting major theater chains to say they would not screen it.

The Federal Bureau of Investigation said in a statement that it "now has enough information to conclude that the North Korean government is responsible for these actions."

The attack involves the use of malware and rendered thousands of Sony Pictures computers "inoperable," forcing the company to take its entire network offline, the FBI said.

North Korea had repeatedly denied involvement in the , which followed sharp warnings from the North's top military body, the National Defense Commission, that the film was an affront to the country's leadership.