Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3fca7bf5f230c9…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 14:23:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e55258b9fe3ae72a4fc1a9e3b9f947b7 SHA-1: cbb94c7a5d797d7d400e86af5fb1ad0f6ee441c1 SHA-256: 0c3fca7bf5f230c941bc715759dc1ed2a3ec7b0cfe979d8b479b7a0fea1b9981
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a website offering 'free generator / game hack' services, a common lure for malicious content. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution attempt.

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.online/app/406889139/coin-master-daily-free-spins-25-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-free-50-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-robux-games_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_004_off00004f50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F50 25164 bytes
SHA-256: d33509a66683953875bb5d60627ba9e55673110799a7d5929b6e62f09f1347b9
font_01_sfnt_off0000897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 18568 bytes
SHA-256: b4b281bb5b6dfe092bf3b90adf491610ab408f1d3fe0f6ae1605b441ac4007a5

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