Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4197578b31b82a…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 01:22:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aa2262b368770303919a5bee0dab4206 SHA-1: afa0b2da70316e0be8758a18b98c25b10c509f24 SHA-256: 8a4197578b31b82a0e781ef1437732f4100ab7c92811e4a25fb07d921b3c2913
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are related to game hacks and free Robux. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or phishing operation. The presence of a 'callback lure' heuristic further supports a scam-like intent, aiming to trick users into visiting malicious sites or potentially engaging in further fraudulent activity. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/www-mistplay-com-how-to-get-free-robux-game-hack
    • https://razredna-nastava.net/files/_GM479516143.pdf
    • https://razredna-nastava.net/files/inappropriate-roblox-games_GM431946152.pdf
    • http://razredna-nastava.net/files/coin-master-fun-hack-online_GM406889139.pdf
    • http://razredna-nastava.net/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • http://razredna-nastava.net/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://razredna-nastava.net/files/coin-master-hack-8-ball-pool_GM406889139.pdf
    • https://razredna-nastava.net/files/roblox-free-robux-com_GM431946152.pdf
    • https://razredna-nastava.net/files/how-to-hack-in-arsenal_GM431946152.pdf
    • http://razredna-nastava.net/files/how-many-levels-in-coin-master_GM406889139.pdf
    • https://razredna-nastava.net/files/free-robux-hack-2021_GM431946152.pdf
    • http://razredna-nastava.net/files/free-robux-without-downloading-apps_GM431946152.pdf
    • http://razredna-nastava.net/files/free-robux-only-1-step_GM431946152.pdf
    • http://razredna-nastava.net/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://razredna-nastava.net/files/legit-coin-master-hack-october-2021_GM406889139.pdf
    • https://razredna-nastava.net/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://razredna-nastava.net/files/daily-spin-and-coin_GM406889139.pdf
    • https://razredna-nastava.net/files/free-robux-master_GM431946152.pdf
    • http://razredna-nastava.net/files/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://razredna-nastava.net/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://razredna-nastava.net/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000545d.bin
69ff5b1a198f0065fd0e9231e077c383cc0ea9ad43b6807d9759cb78740504b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545D 26648 bytes
font_01_sfnt_off00009045.bin
a2a7ac7a6218e91bfe9d4646e3bd4597627ac8b912e46d831d576f7a7619a0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9045 19712 bytes

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