Malicious PDF — malware analysis report

Static analysis result for SHA-256 3651e1aefd0231a2…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 05:20:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 478cce5d896f2368f2c60723d18041cf SHA-1: 53ec78019fb0c0fbe4ab42367a591a351ce2573d SHA-256: 3651e1aefd0231a260a2230f37b83dfc602815c29026e15b0ddd2f7123c454f8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document displays a fake CAPTCHA or human verification prompt, a common lure for users seeking game cheats or in-game currency. It contains an embedded URI pointing to a suspicious URL, likely intended to deliver a secondary payload or redirect the user to a malicious site. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/grab-points-login-game-hack
    • http://library.umla.ac.id//repository/free-robux-codes-2021-real_GM431946152.pdf
    • http://library.umla.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://library.umla.ac.id//repository/hack-coin-master-apk-31_GM406889139.pdf
    • http://library.umla.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdf
    • http://library.umla.ac.id//repository/roblox-hack-generator_GM431946152.pdf
    • http://library.umla.ac.id/repository/coin-master-hack-app_GM406889139.pdf
    • http://library.umla.ac.id/repository/pig-master-free-spins-and-coins_GM406889139.pdf
    • http://library.umla.ac.id/repository/coin-master-link_GM406889139.pdf
    • http://library.umla.ac.id//repository/coinmasterfreespins_GM406889139.pdf
    • http://library.umla.ac.id/repository/minecraft-java-edition-free-code_GM479516143.pdf
    • http://library.umla.ac.id//repository/minecraft-hacks-xbox_GM479516143.pdf
    • http://library.umla.ac.id/repository/google-moon-active_GM406889139.pdf
    • http://library.umla.ac.id/repository/roblox-hack-2021_GM431946152.pdf
    • http://library.umla.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://library.umla.ac.id//repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • http://library.umla.ac.id/repository/how-to-hack-coin-master-game_GM406889139.pdf
    • http://library.umla.ac.id//repository/hack-de-coin-master_GM406889139.pdf
    • http://library.umla.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://library.umla.ac.id//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://library.umla.ac.id/repository/tiktok-free-net_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f98.bin
71f27746cb74d70788744957a484453f1f6893f5161026848bb03dc6e99ff636		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F98 27756 bytes
font_01_sfnt_off00008be6.bin
ab6ac7a62c47e70780bdfe4b5eb456cbea5b71a9f3882ea77f21efaee61dbde9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE6 3936 bytes
font_02_sfnt_off000098cf.bin
fc3b6864308346bb667edf65a60750cf482e642961677f682e1928b6bbdda02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CF 18392 bytes

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