Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e27b1dee5db2de0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 19:48:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4a9ac4dc5f52532ef3ff4a50f9de2ab4 SHA-1: 30cba08a6d7fbea49fd90e8ce9a12f4add556199 SHA-256: 3e27b1dee5db2de09e3b1f9c37e73f50788fcd0a2dccb3e01e5b112c220f293a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising free game hacks and currency. The document body and heuristics indicate a lure for users interested in obtaining in-game advantages, which is a common social engineering tactic. The primary IOC is the redirector URL, which likely serves as a gateway to further malicious content or exploits.

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.tw/app/431946152/free-roblox-premium-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-25-000-robux-for-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-on-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-stop-someone-hacked-hacking-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-robux-hack-2021-download_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/speed-hack-on-roblox-with-cherk-ashed_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robuxian-com-free-robux-code-generator-roblox-code-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-free-hair-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-2k-hacks_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-2021-robux-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/slaying-simulator-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-hack-in-prison-life-20-roblox_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_off00002f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F07 22808 bytes
SHA-256: d587922648ce73e91567e61720a96abfcdcba1779889a67ca0bc8f6c7ebebe67
font_01_sfnt_off000061af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AF 19324 bytes
SHA-256: 69cb3b56c4db01399d3ceb6168eb67ca17ba7a8ee9f6197ab6639efea8a1dd5f

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