Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3256fcfc6e829c7…

MALICIOUS

PDF

228.4 KB Created: 2021-07-03 22:39:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f40031d368ad236fb4baa6d7f7c682f6 SHA-1: 596f4cdf73d66b27dc3c32bbb3fca8d852e3b87d SHA-256: b3256fcfc6e829c714dc22eb6a7c011216aa9d4a8845adf5705adf974078f74b
132 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it presents a fake CAPTCHA and a lure to install a browser extension, aiming to trick the user into downloading a payload. The embedded URL points to a suspicious domain associated with game hacks, further supporting the social engineering lure. No scripts were extracted, but the document's structure and embedded URI suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/pokemon-go-free-egg-incubator-game-hack
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/roblox-carfs-free-2021_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-upload-multiple-music-to-roblox-for-free-2021_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/easy-roblox-hack-2021_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/is-it-illegal-to-hack-robux_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-roblox-2021-easy_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/robux-how-to-get-free-robux_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/growbux-free-robux_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-t-shirt-design-maker-roblox_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/coin-master-spins-hack_GM406889139.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-robux-2m_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-hack-pizza-place-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off000325d1.bin
b1172659be4dc0625d788cd553ac43978dc67960bd1e4d825e5fa2e7f66e5ffc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325D1 25576 bytes
font_01_sfnt_off000361d3.bin
8ef1a3f2a8cafb2066897aec7a46f3c98fb5c38d5f1482995038dd8b255567f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x361D3 18760 bytes

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