Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0de0cab5db12e4e…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 20:57:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 405c1825f211c842ca84bda3fe566910 SHA-1: 3c777e2437ae5c0a3fff76601bd618fdb2f655dd SHA-256: d0de0cab5db12e4e7db0271ca21df05d9b2041a2cdcd424b7ef2219e1e9a2c44
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including one pointing to 'netcdn.tw', which is associated with downloading applications. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are related to game exploits and hacks. The ML classifier also flagged this PDF as malicious with high confidence. These findings suggest the document is designed to trick users into downloading malware 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/406889139/coin-master-free-download-app-game-hack
    • https://www.titastar.com/uploaded_files/userfiles/files/free-exploits-for-roblox_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-card-hack-app_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-no-mobile-number_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/download-hack-coin-master_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/free-roblox-card-codes-2021_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-now-get-it_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hack-animation-script_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-accounts_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/midnight-racing-sur-roblox-free-tier-2-car_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hack-game_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-spins-save_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-weight-lifting-simulator-2-hack-script-download_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-through-walls-in-roblox-jailbreak_GM431946152.pdf
    • https://www.titastar.com/uploaded_files/userfiles/files/get-free-tiktok-likes_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032e1.bin
226b8709a9362a3ed3718703e6a878afa807f4b90db11c7493f589a137563500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32E1 23168 bytes
font_01_sfnt_off0000670d.bin
2166f25561c4373c6e80d06891fd885867d3a729d1a06b695fec64284d0c2295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 18756 bytes

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