Malicious PDF — malware analysis report

Static analysis result for SHA-256 b356ab9ad945705e…

MALICIOUS

PDF

44.4 KB Created: 2021-06-10 20:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 23411ba656c5bc1a8f7d7964f21fffc4 SHA-1: a9d7b96f8e30dc1ef87fba5fc92153c000f8227d SHA-256: b356ab9ad945705ed491947761072d6f5a9e460bc93691c8872122d2789daf3d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link, likely to download a second-stage payload or redirect to a phishing site. The embedded URL and numerous other URLs point to sites offering 'free Robux' or game-related cheats, reinforcing the lure. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-sign-up-game-hack
    • http://digilib-ppsunisma.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/get-robux-for-free-2021_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/can-i-get-free-robux_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-robux-group_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/minecraft-ps3-free-download_GM479516143.pdf
    • http://digilib-ppsunisma.ac.id/repository/earn-points-for-robux_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-password_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/get-me-robux-for-free_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-download_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/hack-the-streets-roblox_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-minecraft-account_GM479516143.pdf
    • http://digilib-ppsunisma.ac.id/repository/mcpe-optifine_GM479516143.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • http://digilib-ppsunisma.ac.id/repository/roblox-how-to-get-obc-for-free_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-pin_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-400-spin-link_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/roblox-army-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f77.bin
1cd7831b6750b3798ec73d8f0c4f2e411e40a3cb0140789107e1cbc845df48dc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F77 24776 bytes
font_01_sfnt_off0000885c.bin
b2a152c83d29e3b7495633311b2b20643790234a52917d8828222463ba717f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885C 19052 bytes

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