Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ec4091189e64e8…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 08:28:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bfe63515f0e6582c7c8f599d5e09929b SHA-1: f3242689f6e06063bb2112538057f1a3919a2028 SHA-256: b8ec4091189e64e8b75a6e818e11fd5936e25e45d5b494dedf058e21eb535c71
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which appear to be SEO-optimized for game hacks and cheats, suggesting a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading potentially harmful content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/479516143/114-hacks-game-hack
    • http://www.visionledindia.com/uploaded_files/userfiles/files/coins-master-hacks_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/coin-master-free-attack_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/cheat-pc-roblox_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-to-scam-on-roblox_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-to-get-free-robux-100-working-secret-method_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/coin-master-free-redeem-code_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/free-robux-without-verification-2021_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-to-get-free-wings-in-roblox-2021_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-to-get-free-minecraft-skins_GM479516143.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/how-do-you-download-minecraft-for-free_GM479516143.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/synapse-roblox-download-free_GM431946152.pdf
    • http://www.visionledindia.com/uploaded_files/userfiles/files/free-robux-points_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d0.bin
8f85430ce0a8f62306914a6aaf475781e28bd138a9e563474a8a100c23c20d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 21992 bytes
font_01_sfnt_off00006144.bin
90526a5d8708cb9048ef93648a16ed66c6c0d6de1b3ad7957a3bca9956e007df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 17968 bytes

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