Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b491e57537a6d58…

MALICIOUS

PDF

34.5 KB Created: 2021-05-24 10:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 626134150597d9a8c5076c340c8e8a86 SHA-1: 30d74509b3482e4cb0e0ecd6ea629fc401f80797 SHA-256: 3b491e57537a6d58ebdb50d05d69b040a3fdf2a390ee4c47e918d6285786e124
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising 'free Robux' and 'game hacks'. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-roblox-promo-codes-game-hack, is identified as malicious. The document body also contains this URL and a call-to-action phrase, suggesting a phishing or scam attempt to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/free-robux-roblox-promo-codes-game-hack In 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_off0000293f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x293F 27104 bytes
SHA-256: 697599bec3d1af2f08eacece3508bed64a3c1b996372db7d7e41cf3225557740
font_01_sfnt_off0000647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 18676 bytes
SHA-256: 9297a3cb5fba7ca587652f513aa1222127deb04773b45a9c0f6482a9c793d56f

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