Malicious PDF — malware analysis report

Static analysis result for SHA-256 139bacf356792056…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 15:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 199d2a3dd8d50cbd70b5d4c8c90a4f1a SHA-1: 7263aa389ba0668d4944ae5bf6e62a8441bd40e6 SHA-256: 139bacf3567920567c94f27befa9476c15948cee19b51ed394b54512fec6c7ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a malicious redirector disguised as a game hack generator, which in turn hosts numerous other malicious PDFs. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirectors and lures for game-related exploits. No scripts were extracted, but the document body and embedded URLs clearly indicate a phishing or scam attempt.

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/431946152/ways-to-get-free-robux-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/roblox-shark-bite-cheats_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-kingsml-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-accounts-2021-june_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/what-is-bad-about-roblox-free-models_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-accounts-full-with-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/admin-console-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-robux-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-download-laptop_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hacks-link-description_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-download-hacks-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/working-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-bc-roblox-android_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-cb-ro-hack-script_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/when-does-john-doe-hack-roblox_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_off0000305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305B 22472 bytes
SHA-256: 4d4ffad66a31d2df357101b1d8b186f727b9c95f065ea13218686a621692d9ff
font_01_sfnt_off00006270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 19196 bytes
SHA-256: 96331d0996f68a985869c858ea36cc40aa482b0fedd10a8c06058efa80dfe966

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