Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68e319d00d62121…

MALICIOUS

PDF

159.3 KB Created: 2021-07-05 10:10:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 345cd53e7a3aef27292c7d242d427fb9 SHA-1: 57f1d98340dcf23cb0c1a5f75ba04aea6563db16 SHA-256: d68e319d00d62121eb8abff341877e22dc5a790a53574cf27cb51d67f45f4b6b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a malicious redirector link disguised as a "free generator / game hack" for PUBG UC. This lure is designed to trick users into clicking the link, which leads to known malicious infrastructure. The malformed stream length heuristic further indicates malicious intent within the PDF structure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0061

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/1330123889/by-pubg-uc-game-hack In PDF document text

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