The immigrant parents of the 16-year-old boy, who cannot be named under a Canadian law protecting minors, had turned him in to police over concerns he had become radicalised by the Islamic State group.
He was prosecuted under a 2013 law that criminalized attempts to embed with the IS group or other banned organizations.
He was also convicted of robbing a convenience store at knife-point in October 2014 with the intention of using the Can$2,200 in stolen funds to buy a plane ticket to Turkey and then cross over into Syria -- which authorities said amounted to an offense for the benefit or at the direction of a terrorist group.
Sentencing is set for January. He faces up to 25 years in prison.
Police say more than 100 Canadians have joined the ranks of the Islamic State group in Syria and Iraq.
At least a dozen men and women in their teens or 20s have attempted to make the trip so far this year.
Six Canadians are also believed to have died over the past two years fighting alongside extremists in Syria and Iraq.
He was sentenced in July 2014 to 10 years in prison.
Prosecutors said Hersi planned to join the Shebab, a Somali Islamist militia that has claimed responsibility for several attacks, including a commando assault on Nairobi's Westgate shopping mall last year.
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