Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3237f200f30c07…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 08:44:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3210660a45a0f7e5e9f0893bc211a27a SHA-1: 3989b5898304c8a30bdf8954fcfa90b74fa1a3b5 SHA-256: 2d3237f200f30c072790b5068f8cd5d6cf6a82180af67699471057ee85e69680
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are related to obtaining free items or currency for popular games like Roblox and Coin Master. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic suggests an attempt to generate traffic or distribute malicious content. The document body and extracted URLs point towards a lure for potentially malicious websites.

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/431946152/free-roblox-accounts-2021-with-robux-game-hack
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-roblox-game-codes_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-com_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/cheat-codes-for-roblox-bloxburg_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/daily-coin-master-free-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-200-robux-for-free_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/gilded-triad-crown-roblox-free_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-mac-free_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/hack-coin-master-android-2021_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-windows-10-free_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-free-robux-codes-that-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000319c.bin
ab8d189acfc0a4c71dd63dd8869447876ffdecf85e3e7933c2e4c83576a59d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x319C 22420 bytes
font_01_sfnt_off000063d4.bin
a55470c357d6117f87c66cfcc5dd60461d5ad292bd735cfee1ec5bb843310ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D4 19780 bytes

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