Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbd7d94841c1db8…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 09:44:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 893b9542e833e1d28350d33914931c5e SHA-1: d2582ef4bfdd034b146e351f7c08e803d4b11f45 SHA-256: 2bbd7d94841c1db8861028dc0b982a74f0baf6d6dddd47752dd5db7f5e626bef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising "free generator / game hack" lures. These links likely serve as a pretext to download further malicious content or lead users to phishing pages. The ML classifier also strongly indicated maliciousness, supporting the observed redirection behavior.

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/431946152/how-to-get-robux-easy-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-hacks-list_GM479516143.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_off00004ed2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED2 24544 bytes
SHA-256: d0dc94c2f8a812a8c30f95044c053b8dc1151a7cc7cab61a9e11879e21e2d92b
font_01_sfnt_off000086d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 18528 bytes
SHA-256: b9e2aa841985fb83527df95ccd87a01b1af2ca35417b0d42f05b7d7a63821dbf

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