Green tea Camellia sinensis has no antimalarial properties.No paper can be found in the scientific literature documenting such a property. And the studies of Mutaz Akkawi have shown that green tea does not inhibit hemozoin like Artemisia annua or afra or sieberi do.
A possible answer can be found in this Czech paper.
Diana Chrpová, Lenka Kouřimsk , Michael Harry Gordon, Antioxidant Activity of Selected Phenols and Herbs Used in Diets for Medical Conditions. Czech J. Food Sci. Vol. 28, 2010, No. 4: 317–325