Malicious PDF — malware analysis report

Static analysis result for SHA-256 03dc237642426689…

MALICIOUS

PDF

28.7 KB Created: 2021-07-05 02:14:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e4b50158e43b49cde47ea2880854539 SHA-1: 5a27b3fa0bcf99ce5e78be5d88442104ce21d1bb SHA-256: 03dc237642426689f9713b3ad5c2f40c3edb8c5085aa92d744e15a2b690785ce
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, http://netcdn.tw/app/406889139/https-iosgodscom-topic-20214coinmasterhack-game-hack, likely leads to a second-stage download. The document body also contains a call-to-action phrase, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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.tw/app/406889139/https-iosgodscom-topic-20214coinmasterhack-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_001_off00001a83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A83 22144 bytes
SHA-256: 8cb2e70c781bae58169daff921bd48c95c25a2a6b49ace013a00ac23d1c5938e
font_01_sfnt_off00004bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD3 19244 bytes
SHA-256: 08ea946be5fb008c0d7bd008b3af5890e72ea8b0061f58924028e5c31f25d00a