Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cb5b3c450e68a3…

MALICIOUS

PDF

36.5 KB Created: 2021-06-14 00:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 13932afbaee72846dab5135e29f22eeb SHA-1: 237ca5c5778f8151d12daac89dabee12e9450181 SHA-256: 51cb5b3c450e68a38f3caf9faa5a71bfb9ed8de37710b4e30203bc275f280d97
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, http://netcdn.co/app/431946152/how-to-change-username-on-roblox-for-free-game-hack, is the primary indicator of this malicious activity. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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 http://netcdn.co/app/431946152/how-to-change-username-on-roblox-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
font_00_sfnt_off0000315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315B 25420 bytes
SHA-256: b0db163a3ad67acd0ac32e43cf49880ae1fd69ea75da505b34e60a13603c7d75
font_01_sfnt_off00006a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 19240 bytes
SHA-256: 0a326c0d94e4ba5b42cc4a4255d11f6f465e6ea82f55ecdc2c3181a0308aa342

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