Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e8e55dc1f5e16c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 21:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f4afc77f7f5a5f6dcbf43484ed8ebec4 SHA-1: 29d7b6d525217751f34ccef6b8cd9550b1e53b55 SHA-256: c7e8e55dc1f5e16c28584530b35c36f8cdfafa73c2a0b2c3c90124dc26466537
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/all-roblox-games-you-can-hack-with-cheat-engine-game-hack PDF link annotation
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/pokemon-go-free-647_GM1094591345.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x546A 25764 bytes
SHA-256: 9523f3f7d3591ddae3cc4e25f6182895aac378f18837f935e32fe0f31473588b
font_01_sfnt_off00008cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB0 19620 bytes
SHA-256: ec6ad3e534d12da03215e6b2123af9900c3571bcec8a011dd58b6449202a9bff

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