Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3023c971cf7565…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 12:25:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3a86b8314a98b8119da9c5ece26595c SHA-1: 2792a9c6bb11ff67491016f345fd8f8e3fb79db7 SHA-256: 5e3023c971cf75659ab30124422ef3f1630ec95e0be48e1ff8f38ef445803be2
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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 http://netcdn.tw/app/431946152/mistplay-robux-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/10-free-roblox-gears_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/descargar-roblox-hackeado-con-robux-infinitos-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/best-sword-in-fight-the-monster-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/player-esp-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-by-watching-ads-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/download-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-game-free-download-for-windows-10_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hackear-coin-master_GM406889139.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_off00002e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E05 22088 bytes
SHA-256: e04a794bc36b906fca3f185a2bc3fb5986464c9700e8f5021527fd9710024bae
font_01_sfnt_off00005ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAD 19400 bytes
SHA-256: 7e97903016aa4e609ba99714bd7fa34905edabc8e1c38ff4a6efcd64954d6305

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