Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6812d5263caf5b…

MALICIOUS

PDF

41.5 KB Created: 2021-04-29 06:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: befc8867a8c616dabde50d0ab027041e SHA-1: e719639058d8f9564f74e9c87c1b2215f2c0b767 SHA-256: bc6812d5263caf5b7affca91e4981de4cbc807b7baa16d5a8ee228be3700dcfb
82 Risk Score

Malware Insights

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

The PDF document employs social engineering by promising a "Hack For Robux 2021" and a "ROBLOX GENERATOR" to trick users into downloading a malicious file. The presence of multiple embedded URLs, including one pointing to `netcdn.xyz`, suggests the document is designed to lead users to a malicious download or exploit. The ML classifier strongly flagged this PDF as malicious, reinforcing the observed social engineering and URL-based threats.

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/hack-for-robux-2021-game-hack PDF link annotation
    • https://guiasderonda.es/ckfinder/userfiles/files/dress-roblox-free.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/funny-roblox-outfits-and-free-outfits.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/roblox-tree-planting-simulator-hacks-pastebin.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/programas-para-hackear-roblox.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/roblox-best-hack-for-jailbreak.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/free-robux-codes-no-survey-2021-october.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/character-robux-hack-in-youtube.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/roblox-counter-blox-wall-hack-download.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/bux-city-free-robux.pdfIn PDF document text
    • https://guiasderonda.es/ckfinder/userfiles/files/btools-hack-roblox-jailbreak-2021.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_off0000449c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x449C 25644 bytes
SHA-256: a07d43c456e714d6d4425f33c8392ccb921050bbb6ee5f999393dad6525d44e3
font_01_sfnt_off00007efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFB 18816 bytes
SHA-256: 1962b9c9795e1733cc6a8b6ed8d8e1c791e7af410e2202646f60ba1693ded620

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