Brazil scored through Duda, Gabi Nunes, Brena, Yasmim, Katrine and Geyse.
The home team played hard in front of a sold out crowd of 12,547 supporters but lacked attack as the Brazilians took charge in the first five minutes, scoring their first goal 1-0 through Duda.
Five minutes later, Gabi Nunes found the net, scoring the visitors' second goal 2-0.
The Brazilians were on fire and wasted no time scoring their third goal through Brena 3-0 in the 17th minute.
A penalty against PNG's Margaret Joseph for tripping Brena gave Brazil a free kick.