Häcken came to Kanalplan with two straight losses in the back, something that made them lose in the top battle and before Friday's match fell to a fourth place in the table.
Hammarby, on the other hand, had won their last five matches, but had to do without the star Madelen Janogy.
Just before half time, Hammarby's Emilia Larsson made a turn where Häcken's Lotta Ökvist did not keep up and felled Larsson.
The referee pointed to the penalty spot.
Emma Jansson took care of the punishment, but burned it.
Dream goals and nightmare minutes
At half time, Häcken's coach Robert Vilhamn made two substitutions that would later prove to be brilliant moves.
In the 51st minute, Marika Bergman Lundin cut with a shot from the 16-meter line - the ball straight up in the crossbar.
Just a minute later, Andrine Hegerberg (older sister of world star Ada) made it 2-0 to Häcken after an entry, both goal scorers were jumpers.
Nightmare minutes for Hammarby, who later managed to equalize through Matilda Vinberg.
The match ended 2-0 to Häcken who broke their negative trend.
Hammarby broke its winning streak in five straight games.