Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5b923137896a30…

MALICIOUS

PDF

41.7 KB Created: 2021-05-19 09:30:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e1a5278ff8e0c42e6bcfe7e7297a97c4 SHA-1: fc8d5b4749293bf08868a49dcd944bc41b0787d9 SHA-256: fb5b923137896a30e81bdca023b160ca31b1020585db948a99ea21b802c324f6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF document contains a high-confidence heuristic indicating it's a lure for a 'free generator / game hack' and impersonates Amazon, with the linked URL not matching the brand. The document body and embedded links suggest a phishing attempt or a redirect to a malicious site. While no scripts were explicitly extracted, the PDF structure itself can contain executable content, and the ML classifier strongly flagged this as malicious.

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/master-coin-free-spin-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/master-coin-free-spin-game-hack PDF link annotation
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/100-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-coin-master-hacks-no-verification_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
stream_003_off00004929.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4929 25108 bytes
SHA-256: 79836b0ab02f1d04c37c38af42109346a6f516eecfbfb1796524505c22d47c32
font_01_sfnt_off000081b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B1 17884 bytes
SHA-256: 2eace5707960ab6674c345fc5925bb74d79b72c9d0e947ec779627780b9711cb

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