Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a9acbaed073dab…

MALICIOUS

PDF

33.0 KB Created: 2021-07-07 15:31:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a504b2495eafd1b10ab6bfe1cb13428c SHA-1: 91277a9de02dc96b854a9505b3f7d41a61f2594a SHA-256: 25a9acbaed073dab6894c657b04a40716a342e2fa46c00c69cb65e4b1d62d6e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to free game items and hacks, directing users to a malicious URL. The heuristic PDF_GAME_HACK_REDIRECT_LURE and PDF_MALICIOUS_REDIRECTOR_LINK confirm the presence of a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains the malicious URL, suggesting an attempt to trick users into downloading or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-severs-game-hack In PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/money-cheats-for-rocitizens-in-roblox_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-how-to-get-free-gear-2021_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/pastebin-free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/games-like-roblox-online-free_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-adopt-me-money-hack-2021-script_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-como-tener-robux-gratis-2021-el-hacker-gato-loco_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-gg-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-hack-2021-april_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
font_00_sfnt_off00002f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3C 21796 bytes
SHA-256: 56022f0f33de3c0b75795db9cd349d9bb4a677bb344046f1912c24a5635f681e
font_01_sfnt_off00005f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F09 17968 bytes
SHA-256: 48bc55e03208a8f2bb08e2877cb4566e36c68f2d0f6b3425dea205355258b605

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