Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f33b122e4f3e16…

MALICIOUS

PDF

44.1 KB Created: 2021-06-10 22:28:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a44a31a4544a1a74a2a5b7f40a97f597 SHA-1: b35210dc8cb3946a9f8a61121f9706dcf7fe5b06 SHA-256: 39f33b122e4f3e1610000346d2025134a200dc1dfbe646deb578f7aa8f4fdf0a
122 Risk Score

Malware Insights

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

The PDF document contains a high-confidence heuristic firing for a fake CAPTCHA or human verification prompt, designed to trick users into interacting with malicious content. It also links to a URL associated with game hacks, suggesting a social engineering lure. While no scripts were extracted, the PDF structure and embedded URI indicate an attempt to redirect the user to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/wix-free-robux-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/epic-mining-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-items-on-roblox-no-inspect-element_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/wurst-commands_GM479516143.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_off000051eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51EB 24412 bytes
SHA-256: 1c984649f84a7fd0119a3879c84a91c291d67d508c8fbce4f92f5536243f6488
font_01_sfnt_off000089b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B2 18332 bytes
SHA-256: dc6d7c8c7778ef754fc706fb192cfbc8f9d6a7af2ee76bdece4c40be3e30ac64

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