Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efb92e6d8adde69…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 07:08:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f7bfd088af2510121d3e178779d54e45 SHA-1: 7efab4f5358a875a0f184cc39f0c11168c70d239 SHA-256: 6efb92e6d8adde69e720ca4b224b3c7d3fcbd5df5456b4cb764dc312ecf8b02b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/how-do-u-get-free-robux-2021-game-hack. The document body and heuristics indicate a lure for free Robux generators and game hacks, a common social engineering tactic. The presence of many external PDF links suggests a link farm designed to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/how-do-u-get-free-robux-2021-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-with-group_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hacks-para-tener-dinero-en-arsenal-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-without-sign-in-also-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-gte-free-robux-codes-for-pc-2021-october_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-accounts-for-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-you-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/como-dibujar-en-free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/generateur-robux-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/poste-eybens-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-hack-free-money_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-gift-card-roblox-codes-2021-list_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-how-to-get-free-robux-promo-code_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_off00002d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D39 21924 bytes
SHA-256: d16204e72e08370df0f1bf305aa81e2e2c9db8fc329bdf7a429cc748481d005a
font_01_sfnt_off00005d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 19556 bytes
SHA-256: ee909949778bcc1eaeaae663f07e5a0770d7aed4eef67476ef7171e54895eba2

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