Malicious PDF — malware analysis report

Static analysis result for SHA-256 6979a8ef4f3aaae7…

MALICIOUS

PDF

39.7 KB Created: 2021-05-23 12:08:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dc8b3b770ccfe150f0ed3fac1762d88f SHA-1: eb763c16ded077786614af1404b8d12e69f5d8f2 SHA-256: 6979a8ef4f3aaae753d4d533bda1cc0312a13b03df432af11b0b3cd60d17b4b2
82 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'Robux Hack' and a high-confidence heuristic firing for a game hack redirector. The embedded link, https://netcdn.xyz/app/431946152/robux-hack-game-hack, is likely the initial stage of a download or exploit chain. The document body and other linked PDFs reinforce the theme of game-related hacks and cheats, suggesting a social engineering tactic to entice users to click malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 4

  • 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.
  • 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/robux-hack-game-hack PDF link annotation
    • http://fobh.net/userfiles/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.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_002_off0000313b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x313B 32720 bytes
SHA-256: f0e16af7ffa515be771d5474f8c05475e4a456e1fad4c8e21ca0311c1081bc0a
font_01_sfnt_off00007a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4A 18248 bytes
SHA-256: dc70545b78036d2d989a53e60713ee6b6ba72604799932bb5b2fc13357d7a02a

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