Malicious PDF — malware analysis report

Static analysis result for SHA-256 a254d31640bcde23…

MALICIOUS

PDF

37.6 KB Created: 2021-05-14 20:32:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4807621bd9b79e461f0821142962995 SHA-1: 65c35990ad3b590392d64a84662595bf8e391a01 SHA-256: a254d31640bcde23e2a6eba3430ca39dbd8ea65759b6c3bbc9fbb5374cd448fa
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "Free Robux Hack" and embeds a link to a known malicious redirector. The document body and heuristics indicate a social engineering attempt to trick users into visiting a malicious URL, likely to download further malware or engage in scams. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/free-robux-hack-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_off000034fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34FC 25820 bytes
SHA-256: 5e9c4662525240baf09828feaf31490249448af5ddd949ee2f8d4d24bcc49567
font_01_sfnt_off0000715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 18412 bytes
SHA-256: 8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4

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