Malicious PDF — malware analysis report

Static analysis result for SHA-256 39acad83bb978cd7…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 05:31:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81c56dd3782706760633741432bd1156 SHA-1: 87aecb460852143f3a735fd8d008ec6e0975a417 SHA-256: 39acad83bb978cd70b1736cff8c36cedb4aec5eb75cdd1e988cf62a7e0a53225
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary malicious redirector URL is https://netcdn.xyz/app/479516143/mc-hacks-game-hack, which is part of a larger link farm hosted on newenglandafs.com. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly suggest an attempt to drive users to potentially malicious content or further download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/479516143/mc-hacks-game-hack In PDF document text
    • https://newenglandafs.com/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-devil_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6C 25220 bytes
SHA-256: 8e87245571f30b7ee6de62096f4948d0778801b6b4e27e0a4891a829f7d85952
font_01_sfnt_off0000849a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849A 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAA 17516 bytes
SHA-256: 132065607850a8f129f85996725383f2c7f1903ebeac8b65de7e8bce9aabb2f2

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