The report, written in Urdu, is a detailed list of attacks carried out on security forces, police and politicians in several Pakistani cities and the northwestern tribal areas between January 3 and December 26.
Released on December 29, it says that in 2015 the Pakistani Tehreek-e-Taliban (TTP) carried out 73 target killings, 12 ambush attacks, 10 raids, 19 IED (Improvised Explosive Device) blasts, five suicide attacks, 17 missile attacks and shot down two helicopters, and claims it killed some 686 people in 2015.
"This report mostly carries big claims, but there is no evidence to support these claims which are often inflated," said Pakistani analyst Rahimullah Yousafzai.
"They have realised that this kind of report is necessary to show people that they are still active and potent," Yousafzai told AFP.
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Pakistan has been battling a homegrown Islamist insurgency for over a decade, with more than 27,000 civilians and security personnel dying in extremist attacks, according to the South Asia Terrorism Portal, a monitoring site.
Analysts have credited the fall to military offensives against the Taliban in the tribal areas of North Waziristan and Khyber where they are headquartered, as well as operations in the country's largest city of Karachi.
Authorities have also taken steps to shut down insurgents' sources of funding and arrested thousands for inciting hatred under a National Action Plan to curb militancy.
Yousafzai suggested the TTP had issued the annual report because "people are saying that their campaign has weakened".
"Its real operational strengths are its affiliates and support networks, which still exist inside Pakistan and... will take time to break," Rana told AFP.