Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cbd967f350655f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 13:54:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 80625204f40bc1abd5d0f988c5aa7d07 SHA-1: b87282c593190930131262251f69787fbcc5df18 SHA-256: b4cbd967f350655f1d697072c99d26883a5e26ef9c047a818dc8e936ec82f0f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure for game-related cheats and hacks to trick users into visiting a malicious redirector. The document contains multiple embedded URLs, including a primary one pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spin-now-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/cheat-codes-no-promises-roblox-id_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-no-survey-or-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-vehicle-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-do-you-use-tunturned-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-offline-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-bee-swarm-simulator-tabby-bee-cheat_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-stuff-that-you-can-get-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/get-free-robux-by-inspect_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/promo-codes-for-free-robux_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_002_off00003202.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3202 23100 bytes
SHA-256: 073b8986d6a54fcaf75470ce4611cbad63001f82a36edd6f72104d638e95eda9
font_01_sfnt_off000065f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 18336 bytes
SHA-256: 6b20469be8faec5c8c7f2170c7fbb481140104050cd6a6398e6de2d19d913737

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