Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c2f41293a5be13…

MALICIOUS

PDF

35.5 KB Created: 2021-06-29 09:18:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f75ea8a0651c24f654f330083a429312 SHA-1: 3addd3bfe0ec1f9b253f078e1bd917aefd6d01a5 SHA-256: c8c2f41293a5be13035f5b5409f6e3fd841b42b2128a2a2229ab3be425b31b8d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The document body and numerous extracted URLs reinforce this theme, pointing towards a lure for game-related cheats. The primary IOC is the malicious redirector URL, which is likely used to host or chain to further malicious content.

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/roblox-sword-fight-on-the-heights-hack-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/video-free-robux-obby_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hacks-para-roblox-windows-10_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-hack-201_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/https-www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robuxmatchcon_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/get-free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/hack-apk-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/top-5-ways-to-get-free-robux-nicsterv_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-more-robux-for-free_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_off000031d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D0 22768 bytes
SHA-256: fb478bd80a5984d097c4ee7c8152786816f2aa9d204b91b133ada6ed51a85d53
font_01_sfnt_off0000648d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648D 19548 bytes
SHA-256: 5e0a1880a137040904cd08ab2d2220d8bd7e2bd7f8f61d69040bbfb1a6287ef7

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