Malicious PDF — malware analysis report

Static analysis result for SHA-256 246ee0d64d426008…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 06:56:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8fefb1129b18c3aaa7e057e5344b9156 SHA-1: 8fee907cb7f13e90d98b42809a117445594bbaa9 SHA-256: 246ee0d64d426008baf60411f59fc9c73e1899bcdbe5d70fec5a0c52b0e05dea
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF gateways for game-related lures like 'free Robux' or 'Minecraft'. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, suggesting an attempt to execute malicious commands. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.online/app/479516143/minecraft-free-ios-2021-game-hack
    • http://bepquannhu.vn/upload/editor/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/minecraft-skins-download-free_GM479516143.pdf
    • http://bepquannhu.vn/upload/editor/files/coin-master-email-rewards_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • http://bepquannhu.vn/upload/editor/files/coin-master-34-6-hack_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/free-spin-in-coin-master_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/free-robux-no-verify-2021_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/robux-hack-no-human-verification_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-spins-coins_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/roblox-generator_GM431946152.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-get-minecraft-coins-for-free_GM479516143.pdf
    • http://bepquannhu.vn/upload/editor/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000537d.bin
ab55262e209532e08937e8ff46b4862f1c5411366a5d8f5eddffa8da5d095d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x537D 24560 bytes
font_01_sfnt_off00008add.bin
b55c1404a277e69c847ae3cf6ace6563469f03eb0031cfae1db94f462975a683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADD 18112 bytes

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