Malicious PDF — malware analysis report

Static analysis result for SHA-256 8105ebe01b08dbe6…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 23:23:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9e8f997f104a053a1953cf4e95e8f81 SHA-1: ef5abeebe03497de0be80366bff78bd4ae0f3de0 SHA-256: 8105ebe01b08dbe6cfb3721c812074c49dc975ce7b4ecdd9a5be1582af026ae3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with 'free generator / game hack' content. The embedded links, such as https://netcdn.online/app/406889139/coin-master-real-free-spins-game-hack, are designed to lead users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirection 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-real-free-spins-game-hack In PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/download-apk-tiktok-free_GM835599320.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/tiktok-free-like-app_GM835599320.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hack-tool-2021_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_off0000516c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516C 26160 bytes
SHA-256: 4ae5866cd6f0fddc461e2493db3f6f9c88c224f154181010082cefe798e1bbe5
font_01_sfnt_off00008c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C26 17960 bytes
SHA-256: 614295126cde334420460b671e97520ef00bc17125d6db356981682f81072261

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