Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc77f9455b473d5…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 06:48:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fa1a83e7de9d8aa7eb31986eb7303adc SHA-1: 000321aad99be6365bbe822e7fe876172a8c4c98 SHA-256: ffc77f9455b473d5715837e4c0b35f3f7b9302fd6c9b55ef5992cdd78f9bd327
160 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering "free Robux" or "game hacks", presented with a "CLICK HERE TO ACCESS" call to action. Heuristics indicate these links lead to malicious redirectors and a lure for game cheats. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the lures and the embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 In PDF document text
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/minecraft-xbox-one-code-free_GM479516143.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_off000033a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A5 26096 bytes
SHA-256: 239be2f47818790c46f524385d3a2613d764f8a5cbf314367160b9129a6d099d
font_01_sfnt_off00006fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 18248 bytes
SHA-256: dc70545b78036d2d989a53e60713ee6b6ba72604799932bb5b2fc13357d7a02a

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