Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e60379ae803c4a…

MALICIOUS

PDF

34.0 KB Created: 2021-07-09 01:07:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 217de0c0c1912a289e55e874fdd1e6f7 SHA-1: de460f45c50a97a49f761f46163db581eb07ca81 SHA-256: c1e60379ae803c4aece7ee4306481f3c36169f10078731c0885e330ccbe5027a
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with malicious links. The embedded URLs, such as http://netcdn.tw/app/431946152/5-games-that-give-u-free-robux-game-hack, likely lead to the download of a second-stage payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/5-games-that-give-u-free-robux-game-hack
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/roblox-hax_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/promo-code-free-robux_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/easy-roblox-hack-2021_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/robux-prices_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/robux-free-online_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/robux-hacks-computer_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/gametest-roblox-com-free-obc_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/free-robux-on-iphone_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/was-minecraft-ever-free_GM479516143.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/minecraft-java-edition-for-free_GM479516143.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/boku-no-legacy-roblox-free-spins_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/coin-master-in-app-purchase-hack_GM406889139.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/bug-free-uniform-of-roblox_GM431946152.pdf
    • http://carpetbcfyarn.com/uploaded_files/userfiles/files/free-robux-promo-codes-august-2021_GM431946152.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/coin-master-hack-apk_GM406889139.pdf
    • http://www.carpetbcfyarn.com/uploaded_files/userfiles/files/mod-menu-in-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ecf.bin
f2b2098fe3918ab163629725a65ed414141954d2faa2ee25d02e69a9c95cf8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECF 21636 bytes
font_01_sfnt_off00005e38.bin
ee71ba8216e778d2f3da542342e90da16a9545585710728a87857fdef6b86d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E38 19616 bytes

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