Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9957265d6bce1a4…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 13:17:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8355dc1a51b004ec75228760a63755ec SHA-1: e509c5439ae023a0ec5d95663f91a90f322f46f5 SHA-256: c9957265d6bce1a4e81a6ea57ab85da8e8968daa1fae4fb536933cd0b415959e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free Robux and game hacks, containing multiple links to redirectors and potentially malicious content. The embedded URLs, such as https://netcdn.tw/app/431946152/free-robux-and-obc-game-hack, are indicative of a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to lead the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/free-robux-and-obc-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-wings-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/22-500-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/pubg-uc-94fbr_GM1330123889.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-de-game-pass-para-horse-world-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/this-game-has-shut-down-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D9 26424 bytes
SHA-256: 836f0d43aae84b1ac0f39df5a6cdbb958026eb766007843d1e37c7bed9bc27f4
font_01_sfnt_off00008d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 18188 bytes
SHA-256: ec8884d6c93831016d0849b6b33b3691ffd41597d780f068ddd3174ac3be97b0

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