When doing keybindings (or modifying settings in general), be sure to look at the defaults included with Sublime Text. The default Key Bindings will be shown by selecting Preferences -> Key Bindings - Default. Searching for "up" and "down" led me to the following entries.
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{ "keys": ["up"], "command": "move", "args": {"by": "lines", "forward": false} },
{ "keys": ["down"], "command": "move", "args": {"by": "lines", "forward": true} }
So, to add your custom binding, add the following to your user key bindings (Preferences -> Key Bindings - User). Be sure to wrap it in square braces (the key bindings file is an array of objects) if you don't have any entries already.
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{ "keys": ["ctrl+up"], "command": "move", "args": {"by": "lines", "forward": false} },
{ "keys": ["ctrl+down"], "command": "move", "args": {"by": "lines", "forward": true} }
Hope that helps.