Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be6dee868de5bf3…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 21:16:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cfa0dddbaa7fe88b0184767640dcb8ce SHA-1: d0bed7eef7476a9cbdca1b11022cdfd000ec7017 SHA-256: 8be6dee868de5bf3ac33cb2a06697af3cdebaea604bbebcda52a02ebd8d46b07
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence. The primary goal appears to be directing users to external sites offering game cheats and currency, which are often fronts for malware distribution or credential harvesting.

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/406889139/coin-master-spin-link-today-free-game-hack
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-game-download-free_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-on-iphone_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-without-verification_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-free-robux-generator-2021_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/games-that-give-you-free-robux_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/worst-roblox-avatars_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/karina-roblox-zombie-free-zones_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/what-can-you-do-with-cheat-engine-on-roblox_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-do-u-get-free-robux_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-no-download_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-2021-link_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-spins-from-coin-master_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-promo-codes-december-2021_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/funbloxxyz-free-robux_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032dd.bin
84afb0107fcbd562b3d8ef8acce23b36e840e09c6e0bfc7e978ce451a37c6403		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32DD 23364 bytes
font_01_sfnt_off000067ea.bin
a82e7d6c674e876005ad91f169d74ccb0002f7b2bc0316871cc95b3b2936fb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EA 18696 bytes

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