Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fad859cdbad7ff…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 12:40:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 72f4625bdcf5c1e142e152c6c9804498 SHA-1: 093d748dc02301ef797dd32a6aa6b91f6c7cd3f8 SHA-256: 29fad859cdbad7ffbf75dc0846077e791df8546138a3d34c6d39ca9d655e844c
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, which is a common lure for malicious content. It contains an embedded URI pointing to a URL that likely serves as a download source for a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-get-free-roblox-gift-cards-game-hack
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-robux-page_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/link-for-free-coins-in-coin-master_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-home_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-com-real_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-app_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-hack-apk_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/spinuri-gratis-coin-master_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/free-robux-no-survey_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/minecraft-education-free_GM479516143.pdf
    • http://sman1negara.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-for-android_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-website_GM406889139.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/minecraft-free-download-laptop_GM479516143.pdf
    • https://sman1negara.sch.id/new/public/ckfinder/userfiles/files/coin-master-ios-gods-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054b4.bin
2ea7742765a882a6d0afc0d21f1a06735e5e62846df162753ad18b55e30a6f3a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B4 28320 bytes
font_01_sfnt_off000094b0.bin
4ca4edcee29dbb5ec5fd43b786ee3a040f637d4fa80ece8255e459f77acc63d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B0 18740 bytes

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