Malicious PDF — malware analysis report

Static analysis result for SHA-256 15542af35b8f85e0…

MALICIOUS

PDF

43.9 KB Created: 2021-05-13 17:33:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e744e519ac1e7dbf4169732ee6c491d8 SHA-1: 66796c1b2b391502dda260e67a470b492cc45308 SHA-256: 15542af35b8f85e052e6b77cf0b7f4642c857220048a428cc16e72f8bafffb3e
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick users into interacting with it. It contains an external URI pointing to a URL that promises free Robux, suggesting a lure for game-related scams. The document also embeds multiple URLs, likely intended to redirect the user to malicious sites or download further payloads. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/websites-that-give-free-robux-game-hack PDF link annotation
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2A 27028 bytes
SHA-256: 819c8e654345caaf91771720f68417bffe7c8071f1564c3c9c497e96b1ccfe9c
font_01_sfnt_off0000874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874D 18944 bytes
SHA-256: 78a0fcf68a5d31112d03f33f6a87e59a8dd4ec5e5d54fb5213929ff381de215f

Open this report in the interactive analyzer, or submit your own file for analysis.