The hook_cron_pre_execute_FUNCTION(&$hook) is invoked just before running the cron function.
Call another function instead of the defined
function hook_cron_pre_execute_node_cron(&$hook) {
$hook['callback'] = 'mymodule_steal_cron_function_from_node_module';
}
function mymodule_steal_cron_function_from_node_module() {
error_log('PWNED');
}