Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3839d223d640a2b…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 02:47:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1406123ece152b2b82f924fb7a19ed69 SHA-1: 39a37972602c064f45673f0eae01d85cdbe9d651 SHA-256: f3839d223d640a2b8854abf85a76407ba51306ae91aeed3d65f54c0a0f9791e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks or generators, likely to lead users to phishing or malware download sites. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-hack-roblox-accounts-2021-easy-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robloxlover69-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-followers_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
font_00_sfnt_off0000547a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x547A 25404 bytes
SHA-256: e1a4ec571986841cc3046033d0f8a2c880a7a70ad8794b097024ee53028d0d65
font_01_sfnt_off00008e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E07 19172 bytes
SHA-256: 0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708

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