I've build a universal app. On OS X file system XCode project with all resources and submodules take about 100 mb, but when I generate ipa file for ad-hoc deployment I get 300 mb file. Several months ago when I had standalone iPad app, ipa was at most 15 mb. Is it something to do with settings?
I have found a problem. Lots of pdfs (for testing) went into archive. Thanks to @rmaddy! I should have paid more attention.