Malicious PDF — malware analysis report

Static analysis result for SHA-256 b738ed902e444cbd…

MALICIOUS

PDF

35.6 KB Created: 2021-05-11 21:07:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d255e3ff4c15e37239755fb67103e50 SHA-1: d2bacb8ebd7235ad31f86d24a1e42a3cb81712af SHA-256: b738ed902e444cbdb1b1646b13fc5800d127038ce184a196f79cd93bfdc11158
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting a 'Coin Master Free Spin Link App' and 'game hack'. This indicates a social engineering lure designed to trick users into visiting a compromised site, likely to download further malware or engage in credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/406889139/coin-master-free-spin-link-app-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_off0000321c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x321C 24616 bytes
SHA-256: 5bdafb3df6bee151910e88ed3774ab5f5694a8702ce5059350734972fc496ff0
font_01_sfnt_off00006a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5E 18056 bytes
SHA-256: 82bd5e5fc9f9c8e10db102fb3f3c15aafc022ab197dd07e70821ea88e25dcd6f

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