Malicious PDF — malware analysis report

Static analysis result for SHA-256 a697a5f62e0ce47c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 16:36:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: eb715211c0657433acf9e1c917349a86 SHA-1: 59ed181a587cc7249d7e25982dbce7b2c555f19a SHA-256: a697a5f62e0ce47c5bf76bf9d4f21cb0661d50f46f0fcc9981a171b59cf8841e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators. The document body and embedded links explicitly point to URLs designed to lure users into clicking, likely leading to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

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-spins-link-today-new-game-hack In PDF document text
    • http://oca.undil.tl/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-hacks-real_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-timoty-hacks_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-cheat-engine-bypass-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-roblox-free-pc-windows-7_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-game_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_off00002fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEC 22140 bytes
SHA-256: 3cdf2ef797d3fafdda04648c24d8d4275376f9db0f1d760b7377c39bcff27fbd
font_01_sfnt_off000060d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 18864 bytes
SHA-256: c2b00cda6ccae936c285d4a8f1a252405c0779bc4d7804dfd8560043eb77b64f

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