Malicious PDF — malware analysis report

Static analysis result for SHA-256 78caf34c31ebb22e…

MALICIOUS

PDF

40.4 KB Created: 2021-04-24 17:16:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e079eb10fc0b3707452f357e30d70a3 SHA-1: 9a407a4b702c2e072492473ef0083b818ff778d3 SHA-256: 78caf34c31ebb22ea9ec634f5c0d569dd1fd5cbb50df1c0c53774e46ebf6495f
82 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, specifically a browser extension or update installation scam, to trick users into downloading malicious content. The document body and embedded URLs promote the idea of hacking or cheating in the game Roblox, directing users to external sites that likely host malware. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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 https://netcdn.xyz/app/431946152/roblox-acount-info-hack-with-robux-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-bc-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-for-nothing.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/criminals-vs-swat-roblox-hack-script.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-items-for-free-in-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-cards-tk.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hacker-roblox-server.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-hack-in-every-game-in-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-no-game-download.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-base-terrain-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-robux-for-free-com.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_off00004210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4210 25248 bytes
SHA-256: 3483ae170831fbe12aa3bf827bd6b8a69488ee5f2a3af467c22f21b5d1500880
font_01_sfnt_off00007a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 18908 bytes
SHA-256: 4ab90719c9cd507f169686d3a3b8932921b05c466cdf124e2f28c1edda213fe9

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