Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3fff055e7c0300…

MALICIOUS

PDF

42.8 KB Created: 2021-04-23 17:04:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 89f6aaabe33b3f4ae4826b6253f16752 SHA-1: 705373f6739ae1df1da4aa5c95e6fda0823e572a SHA-256: 3c3fff055e7c03000300f41fc198c1f7ebde245e694dc1a8fb32b67eb425c637
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'free Robux' and game hacks, directing users to the malicious URL 'https://netsecure.top/app/431946152/free-robuxks-on-roblox-game-hack'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to lead users to a phishing or malware download site. No scripts were extracted, but the document's structure and content strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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://netsecure.top/app/431946152/free-robuxks-on-roblox-game-hack PDF link annotation
    • http://vetmed.fkh.unair.ac.id/repository/roblox-ultimate-boxing-hack.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-2021-winwos-n8.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/gears-online-rpg-roblox-hack.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/electrification-free-robux.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-get-free-16-bit-in-roblox-skywars.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-roblox-accounts-2021.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-account-hack-script.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-passwords-for-roblox.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hacks-vermillion.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/hack-client-roblox-may-2021-injectors.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_off000042df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42DF 29344 bytes
SHA-256: f7e4573d948e2a0d48ae0a936e0635799d934cc477490eaeef4ff4c3dd51680d
font_01_sfnt_off000085b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B9 18256 bytes
SHA-256: 9fdb1e7fb7136b53e6da5d89d4849d82bfc636f56b53b48993c7de7ed1df9552

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