Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4b30d20cbf0ab8…

MALICIOUS

PDF

39.3 KB Created: 2021-05-16 16:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d14b353e784456c4a639f35709f82ffa SHA-1: 504d344444db27c4ea8af679f4d0a95ad334da0b SHA-256: 3d4b30d20cbf0ab8486a7e11a629c3396489e18d855177f28e6ab29ca05e6830
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a redirector link that masquerades as a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/431946152/how-to-hack-and-get-free-robux-game-hack, is designed to lure users into clicking it, likely leading to a malicious download or further compromise. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to exploit user interest in free items to initiate a download.

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-hack-and-get-free-robux-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
font_00_sfnt_off00003890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3890 27108 bytes
SHA-256: b691ceade650ca5ca339dc7ab6b6a0aac607108b85dfc49bcc7eb2a572859cc8
font_01_sfnt_off00007677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 18856 bytes
SHA-256: d1af75e50eba08e00cb44d21026f4cdbf29920fa5250f1112d9d0eb56b6eb802

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