Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38dfdb89e588b36…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 19:42:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3905370aaf06f2130ac6d2a7d565c217 SHA-1: 914d45c3302be1c31ca6df5593aa0448cf958ee5 SHA-256: b38dfdb89e588b3664ff6ea1d26de9c909a1b63b6e9c1f0d401caada647cd187
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector lure, specifically pointing to a URL promising game hacks. The document body also contains this URL and numerous other links to similar content, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/www-free-robux-com-game-hack In PDF document text
    • https://vieclamjapan.com/upload/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-admin-hack-tool_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-bux-cheats_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-tricks-cheats_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-cheat-for-two-player-millitary-tycoon_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/hacked-shirts-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/como-hacer-un-hack-para-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-coin-master-spins-2021_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
stream_002_off00002f6b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F6B 22464 bytes
SHA-256: 56ac99e9de4eeb925783ed0865c5630a1e0cfe74bfa51c26955ce07c65c27a34
font_01_sfnt_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 19336 bytes
SHA-256: a173ff8a3a1fb1a8f757a1ab0f7adc35a375ad8a6d6bf5003b7cfea3ec8bf678

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