Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fccec0084d4dae…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 05:59:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6b6e9a8eeb7fe51a5995a3fe9e439666 SHA-1: 48eb88e49f81e1400c5dcd58d92b4ba46d577656 SHA-256: 55fccec0084d4dae5523d2a04dd08902e40c6e7371c6fc1f5b6cce595714e4d5
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It contains an embedded URI pointing to a URL that likely hosts a malicious payload or phishing content. The ML classifier also flagged this PDF as malicious with high confidence.

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/jailbreak-roblox-free-money-generator-game-hack
    • http://digilib.ulm.ac.id/pusat/repository/juego-hackeado-de-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/earn-free-spins-for-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-cheats-switch_GM479516143.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-not-fake_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-printable-minecraft-coloring-pages_GM479516143.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-free-sin-pastebin-2021-con-jugar_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-codes_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-gifts-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/jailbreak-roblox-hack_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/robux-generator-without-human-verification_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-hack-us_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/inappropriate-roblox_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-pe-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f9.bin
9186ad1501723dcd0e34531a08a859b6628ff3cd2afe96b4b05cfd582491aac6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F9 25936 bytes
font_01_sfnt_off00008b8d.bin
52eb70af9d5f294d4ef567b08cdc4dee109a4827c2b2ecbbfd266c3021742a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8D 19112 bytes

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