Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca92bf6b3c9afd7…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 07:08:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c54932d8b5dd0e161229263467365b58 SHA-1: 7d05dec5e314467dbd8ab13111fd122831ddd743 SHA-256: bca92bf6b3c9afd7a1c24d07731275cdfe5ccefdf66d71e75910ec7037489aa6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, directing users to a malicious URL. The document body, though heavily obfuscated, contains references to the same malicious URL. This indicates the primary purpose is to trick users into visiting a potentially harmful website.

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.tw/app/431946152/roblox-free-admin-script-game-hack In PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-do-you-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-robux-sans-verification_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/tiktok-free-real-fans_GM835599320.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-robux-no-vericficaton-required_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/robux-hacks-2021_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_off0000516e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516E 25328 bytes
SHA-256: 9c6678be5503e3a58815c3e4d48836243e1c03f88c327b9380a418e6acc33abc
font_01_sfnt_off00008b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2A 18784 bytes
SHA-256: 0d186a67970d37dc81f0b40f8f7917958dc7ece3a47822d53c2593eaa3af0977

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