Malicious PDF — malware analysis report

Static analysis result for SHA-256 735f43ebff31ef66…

MALICIOUS

PDF

48.8 KB Created: 2021-05-16 08:31:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 21891ccf48841c23c2a335e5f19f0023 SHA-1: cc8aed2f2a2a02e68ea5d356991c843523d44b14 SHA-256: 735f43ebff31ef668df5b1b1964cc71f68dcd053f2948aae8800880826f16463
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that point to known malicious redirector infrastructure. These links are presented as lures for game hacks and free spins, aiming to trick users into clicking them. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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.xyz/app/406889139/legitimate-coin-master-free-spins-apk-game-hack In PDF document text
    • http://fobh.net/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE1 24672 bytes
SHA-256: eca692e26b6395b1385c60d0f7215688507057394b8ddd096e21e6047cf12548
font_01_sfnt_off000083c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C8 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off00009169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9169 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B59 18604 bytes
SHA-256: 744d2d183457972f47b0db91107cea2f4bf33f1c8b8b46bcb558057de1b31a04

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