Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75a0dd83a00498b…

MALICIOUS

PDF

48.4 KB Created: 2021-06-11 06:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a9357e27a3466ea6e2a7b5c3fa37f5d3 SHA-1: 4e40d01f37cb7828f597a70972dc7775ef43d5c1 SHA-256: b75a0dd83a00498b57ecc5fc5d30e8ca2e89cc58f9e23835504303c498a3814f
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely to initiate a download or redirect to a malicious site. The embedded URL points to a resource that is likely a payload or further lure. No scripts were extracted, but the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-gamepass-roblox-v3rmillion-game-hack
    • https://www.iseas.com/uploaded_files/userfiles/files/cheats-coin-master-free-spins-and-news_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-apk_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/como-hackear-el-juego-coin-master_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/complete-offers-for-robux_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/robeats-roblox-hack_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/get-free-robux-online_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/youtub-robux-hack_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/hack-coin-master-8-ball-pool_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-link_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-free-robux_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-free-lvl-7-script-executor-2021-august-2021_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-login-hack_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-cheat-codes-2021_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-no-human-verification_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f0.bin
c4df6f458674a24c61dcf83968387995533ff40e09438e92c5c398cb0ccf8e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F0 25580 bytes
font_01_sfnt_off00008aee.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEE 5696 bytes
font_02_sfnt_off00009800.bin
18997268d48ee58c3e705dbaf60aee2f497691b4d75a9de0e777f8b258eee253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9800 19040 bytes

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