Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c12bfafa7732a0…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 05:05:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9a95fef229c0596719247b747a05253f SHA-1: 08955c1baef2e3c88c8c5ce48517e87cad8322db SHA-256: 42c12bfafa7732a06ab8bb5c97c7de9267982fffd3a535489c2ee54dfd8613b0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The primary lure appears to be a fake generator for Roblox Jailbreak. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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/roblox-jailbreak-hacks-for-money-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-credits-galaxy-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-a-free-100-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/link-for-free-spins-on-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
stream_004_off00004f2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2E 26108 bytes
SHA-256: f1634bc3e487db0435bb7bc73f5a18486be042ea1fc487b0fa73b39eb153778c
font_01_sfnt_off00008b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B38 19008 bytes
SHA-256: 2101c1caa5bb50be908b1033061f0b49934d13be1490c0c2563892eefa7f96ab

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