Malicious PDF — malware analysis report

Static analysis result for SHA-256 497c2e6ad62e8aae…

MALICIOUS

PDF

37.8 KB Created: 2021-05-13 13:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef8cfbce6b4d69c468d3a94a1766ba3b SHA-1: 12361537e45868d14c808ffa0180521b4a78831e SHA-256: 497c2e6ad62e8aaea191ed5d0f5d3d0fbf7bd5296a18c504cdfc7eab256c4c07
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-100-robux-for-free-game-hack, is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and lure suggest an attempt to redirect users to a potentially harmful site, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/how-to-get-100-robux-for-free-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_003_off000036c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36C5 25612 bytes
SHA-256: 87eee5f899bdc15c4348fd2e854893766bd6ffdcd56af8821de592964b4ae2cb
font_01_sfnt_off0000718e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 18560 bytes
SHA-256: ebe7febd7c9c87dba90e20cfb7f210acfd9bc8f8383e28ef55b41a5f3c0fccc9

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