Malicious PDF — malware analysis report

Static analysis result for SHA-256 328762f3a7fd79a1…

MALICIOUS

PDF

49.7 KB Created: 2021-05-15 15:42:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8bc856599269fd76176b2f0623d4270d SHA-1: 97d8a321d7792b10de26a2c22aa89e1349d19ef8 SHA-256: 328762f3a7fd79a199a3fc1aabb4bcc1b4e32bdbdf6888bea87535452a17a8f7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs social engineering tactics, presenting itself as a free download for a popular game to trick users into executing malicious content. The 'SE_CLICKFIX' heuristic indicates that the document likely instructs the user to perform an action, such as pressing Win+R or pasting a command, to bypass security measures and initiate a download from one of the embedded URLs. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

Heuristics 4

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/minecraft-pe-0.15-0-apk-free-download-game-hack
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-coins-2021_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-robux-on-phone_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/mcpe_GM479516143.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/roblox-robux-hack-generator_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/microsoft-rewards-robux_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-spin-coin-master-apk_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-coin-link-coin-master_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/krnl-download_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/roblox-free-online-game_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-spin-hack-pc_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-pet-food-for-coin-master_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-online-hack-tool_GM406889139.pdf
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e09.bin
7ce4c70ea4c4cff67920a76049d91cae6d88b0ec833f89da4a45f08c16bd9cd4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E09 25148 bytes
font_01_sfnt_off00008726.bin
3fc7793293cdcceb251acccfc65322abcdda1758b2f5977542f4eaeb80d8ad04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8726 3364 bytes
font_02_sfnt_off0000929f.bin
4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929F 2816 bytes
font_03_sfnt_off00009cb0.bin
9273c8c2b8a269721a9438858e1c0aeb95c142b4551f9d4ca11e724d76d79d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB0 19268 bytes

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