Malicious PDF — malware analysis report

Static analysis result for SHA-256 770b2058772c1c9c…

MALICIOUS

PDF

49.4 KB Created: 2021-06-10 18:40:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 58db59e176723f4bd69fa25e5ffd08b1 SHA-1: 163405c580fa420470b7b0f122f2d0e54dad9096 SHA-256: 770b2058772c1c9c1cd97b9790e3ac4e1f7b097af48c360118d9c3132fc51144
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a link farm, directing users to download sites for popular games, which is a common lure for malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a download button heuristic further supports a malicious intent to trick users into downloading unwanted software. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/roblox-windows-10-free-download-game-hack
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/roblox-hack-site_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/free-roblox-codes-2021_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-link_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/codes-to-get-free-robux_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/old-roblox-accounts-for-free_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/free-tiktok-likes-generator_GM835599320.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/fb-coin-master_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-hack-software-download_GM406889139.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/how-to-get-free-tiktok-followers_GM835599320.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/114-hacks_GM479516143.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/free-robux-2021-april_GM431946152.pdf
    • http://www.agasrestaurant.com/uploaded_files/userfiles/files/coin-master-free-spins-april-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054a8.bin
3286fdb1de0ae46a23e7a7b20daafbef1c49bbcf3a05c962e3bae0da6fa153f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A8 31368 bytes
font_01_sfnt_off00009bf9.bin
d41f77d624945e52f280f76fa4ff4a2f3c946c312f57889d4885bb03fcab223a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF9 19276 bytes

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