Malicious PDF — malware analysis report

Static analysis result for SHA-256 570d8fb524d7679d…

MALICIOUS

PDF

41.5 KB Created: 2021-05-12 14:34:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4e14361fb256b2d218d2ef4c4f508e12 SHA-1: 93fc087a4c86763bb74fa8ec674d754d5e297ea0 SHA-256: 570d8fb524d7679d9f6dc4d4ceb9d7f533e1e12f232c8c63072ad8670ba1cc8b
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9971

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/free-spins-coinmaster-game-hack.
  • 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.xyz/app/406889139/free-spins-coinmaster-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-games_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
stream_003_off00004829.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4829 24716 bytes
SHA-256: 35a6c85346967320a497d36a9607ee8e7ad77caba59d144574165d11c494d313
font_01_sfnt_off0000802b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802B 18148 bytes
SHA-256: 022383ce4ee195efe1c5dea367cdebf7cbe1f3fcf8800e4ec6c2e24f5959d50c

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