Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc32b42735d51bb0…

MALICIOUS

PDF

42.6 KB Created: 2021-04-26 17:49:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a5bb2e824a0679f4b9a0cbdc7c9ea21e SHA-1: 1999ddbac80905fb9e87a9c6a24ab7d47d4cf383 SHA-256: dc32b42735d51bb0537dcdb0a2ce2d46ae3870e2dafde45e7a552781b4e28dfc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a game hack lure, specifically targeting Roblox players. The embedded URL and numerous other URLs point to sites offering 'free generators' or 'hacks', which are common pretexts for malware delivery or phishing. The document body, though heavily obfuscated, contains references to these lures and potentially malicious URLs, suggesting an attempt to trick the user into downloading a payload or visiting a compromised site. No scripts were extracted, but the overall pattern strongly suggests a malicious downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/noob-vs-pro-vs-hacker-roblox-mad-city-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-free-robux-codes-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-rc7-cracked-hack-exploit-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/pastebin-link-for-free-robux.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/getgaming-resources-roblox-hack.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-a-shirt-for-free-on-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-get-free-pants-and-shirts-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-codes-not-used-2021-july.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-on-roblox-on-ipod.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-roblox-admin-commands.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/boku-no-roblox-hack-script-buy.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_off00004484.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4484 28372 bytes
SHA-256: 50fef2129fa598217c77e83652ef0763cb50c786441de1542b772590265d007c
font_01_sfnt_off000081f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F5 19244 bytes
SHA-256: 290b4c427812eec4c4c1596e768b14a55947af8ac5cb625d831f6c676c6a1289

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