Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1732bcd4519c9b…

MALICIOUS

PDF

40.9 KB Created: 2021-04-22 16:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0563e884f0cdfb276af3abb7fff673d3 SHA-1: 71bae83762e76c56c321ddf24a44af82f1483d14 SHA-256: 9b1732bcd4519c9b196d5069def36398ae0f01d79ddee108cbc8dbeacc658ad7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it's a lure for game hacks, specifically for Roblox, directing users to a suspicious URL. The document body reinforces this by displaying text related to 'free group funds' and a 'generator', along with embedded URLs that lead to potentially malicious sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9056

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.pro/app/431946152/how-to-get-free-group-funds-on-roblox-game-hack PDF link annotation
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/descargar-hack-de-jailbreak-roblox.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/devil-roblox-hack.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_off0000369f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x369F 31648 bytes
SHA-256: d076dce68df4483798dcda5069607186e918fc8abb4255557de9d69263d7be3c
font_01_sfnt_off00007d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D25 18708 bytes
SHA-256: 48a1c5adfa54a331df1211d8c1d469ba8c2c82cc135ab830858e1614791735a6

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