The campaign will drive traffic to a , created by Abel & Baker, the interactive marketing agency.
The site features a fortune teller Madame Psiquico, who, through a mathematical trick, can predict which cartoon face a user is looking at by "reading their mind".
The visuals then change to reveal the message: "You don't have to be a mind reader to know who suffers most from war." It prompts the user to donate money or find out more about War Child.
Chris Clarke, creative director of Abel & Baker, said: "The war in Iraq is a living nightmare, especially for that nation's children. If people respond to the campaign, we'll have been able to help in a small way."
The agency has won work for a previous campaign for War Child, a viral appeal for the Afghan Bakeries project.
James Topham, head of communication at War Child, said: "Abel & Baker's award-winning work for our Afghan Bakeries appeal increased both awareness of our work and donations to our cause. We are proud of this new campaign and hope that it reminds the public both of the reality of the children's suffering and what they can do to help."
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