Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15c553ae73e42a8…

MALICIOUS

PDF

36.1 KB Created: 2021-05-10 10:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad6aae21e926f86b8a0ceacbf83c2f01 SHA-1: 0f52461aa8c77782ad1657ee19baa75c8da98257 SHA-256: e15c553ae73e42a8e27187386798f292cfa66f1a3aa83f7ac6315c47c2588242
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a lure for a game hack generator, linking to known malicious redirector infrastructure. The embedded URL, 'https://netcdn.xyz/app/406889139/coin-master-free-spins-app-game-hack', is identified as malicious. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to redirect users to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

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-spins-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_off0000350b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x350B 24936 bytes
SHA-256: 0f2ebec6f0b31d3d6b5799a54f1d32ae537fefd59b943a192d5be1bb6c4b1f25
font_01_sfnt_off00006ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 17884 bytes
SHA-256: 21af4872a04c62c178ac31651a333ecdcea5bb1ed4ceeeef1956d42e8fc37ea8

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