Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bfaecb00f3d63a…

MALICIOUS

PDF

34.1 KB Created: 2021-06-22 14:09:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 92610ad8df325c598184bc227a3f362f SHA-1: 33e7717b47fde3b6175722d3596d26f0aa2c383e SHA-256: b3bfaecb00f3d63aeeb4d39e1f7c7057495724ce4792bf25577fae4064497487
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which is a common tactic for distributing malware or leading to phishing sites. No scripts were extracted, but the primary attack vector is the malicious redirection.

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.co/app/431946152/my-robux-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/bl4z3-games-com-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-apk-hack-unlimited-robux-ultima-version_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/my-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-any-gamepass-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-free-robux-party_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-on-roblox-in-3-simple-steps_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-spins-coin-master_GM406889139.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_off00002f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2A 22196 bytes
SHA-256: d8e32a324a3a88c2d7ecd6368a20e8aaa35c9e819a586409440156488d9a90ec
font_01_sfnt_off0000606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 18928 bytes
SHA-256: 14cf274b01691526a034cd80ffb5813761f9bda787693fa387927f947764b857

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