Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6221666127a516b…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 14:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 22afc03de66442ea397763650b80ecfb SHA-1: 47a6d6a267f6e8d039d21ea335373bd8b721cc9c SHA-256: e6221666127a516b47d0b99a4a341753cf8d7b9594e48d3d7c7ac16490a87b03
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks. The embedded URL, https://netcdn.online/app/406889139/coin-master-tiradas-gratis-2021-game-hack, is flagged as malicious and part of a redirector infrastructure. The document body, though heavily obfuscated, contains references to 'game hack' and a URL consistent with the heuristic findings. No scripts were extracted, but the primary attack pattern is social engineering via a malicious link.

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-tiradas-gratis-2021-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-view-kong_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.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_off0000510e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510E 24200 bytes
SHA-256: aef841a2f887420362bffe4a44b7e02be2505918aba653508ad36e49874d5835
font_01_sfnt_off0000882e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882E 18120 bytes
SHA-256: df7c0bd6e0b176154b85c97f6bc04aa0c4a07bedf55487f170f3c6ac2e88131a

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