The video released by Maryam shows Accountability Court judge Arshad Malik telling a PML-N worker that there was a lack of evidence against Nawaz in the Al-Azizia Steel Mills case.
The former PM is currently serving a seven-year jail sentence in Lahore's Kot Lakhpat jail about the reference.
While the accountability judge has decried the video as being fake, Maryam told party workers during Sunday's rally that Nawaz is "paying the price for raising voice in the public's favour," according to Geo News.
She has since been slammed by leaders from the Pakistani government, including the Special Assistant to Pakistan Prime Minister on Information, Firdous Ashiq Awan.
Firdous said that Maryam's efforts to hoodwink the public had failed with the accountability judge`s clarification on Sunday, adding that a forensic audit of the video will be conducted to check its authenticity.