Malicious PDF — malware analysis report

Static analysis result for SHA-256 514b5d03d1d13e6d…

MALICIOUS

PDF

34.3 KB Created: 2021-06-28 04:56:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bc5dfb84d7941c859b7096a9446dc648 SHA-1: 50a830c6c6e6eeb1b034363fd1959bf5c1a870b9 SHA-256: 514b5d03d1d13e6d653d01c39c6f48ca9e04d5841ee649bfc67802fbfb1aa25d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm designed to attract users searching for game cheats like "Free Robux". The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests a redirection to potentially harmful websites. No scripts were extracted, but the overall structure and content point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-that-uses-rechachapa-game-hack
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/give-free-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/easy-how-to-get-free-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/robuxlove-net-free-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/when-pokemon-go-free-will_GM1094591345.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-earn-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-get-minecraft-dungeons-for-free_GM479516143.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-get-200-robux-for-free-2021_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-a-roblox-account-using-command-prompt_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-tiktok-followers-no-survey_GM835599320.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-get-free-roblox-clothes-2021_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/25-free-spins-coin-master_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/roblox-studio-free-download_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/tiktok-free-view-iphone-video_GM835599320.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-do-you-get-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ef9.bin
377698f5db76c43da3c3d9c21bdeb875a5060a8194347248d3bc8440bdda8bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF9 22348 bytes
font_01_sfnt_off0000608d.bin
bd8ded2aca11abd55b50ba614dba6768cc391b18def2968aaf97d4b5489f9d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 19160 bytes

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