Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf2b401fb9a73e…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 18:20:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 539c491705646f58d5b8bd883b7fe921 SHA-1: 94166c305f82972c4b98c8b833160c21ea979b61 SHA-256: 8bcf2b401fb9a73e2a8582b75ffc4c57ebe98a4c9d99584b33c252f90e17f085
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "game hack" which redirects to known malicious infrastructure. The document body and embedded URLs suggest a scam related to in-game currency or items. While no scripts were explicitly extracted, the nature of the redirect and the ML classification indicate a high likelihood of malicious intent, possibly leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/roblox-money-hack-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FE 25664 bytes
SHA-256: f46231e0f49400e5d136dc057425cfa658bb79b160c866af64ceef3823c61b80
font_01_sfnt_off00008cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDC 3356 bytes
SHA-256: 54ca5f183c8827789ad34365b5ef0d70b498d6d5924ebb17996f2fb68da3581b
font_02_sfnt_off00009865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9865 18560 bytes
SHA-256: 2877ec179c3d1975899223932944ba0d35aae080e47210864d1f1454656c8d43

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