Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c7a936619f2d3c…

MALICIOUS

PDF

30.4 KB Created: 2021-07-22 16:20:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 524adb5c4627ae0fdefe7eea6c3ff660 SHA-1: 6459f338035d12bdcae328b5cbeaa378681a6f7a SHA-256: 37c7a936619f2d3c6f157d258443b257a54fa3aafb04678445b9e040342d531f
170 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a malicious redirector lure, specifically advertising a 'free generator / game hack' for TikTok likes. The embedded URL 'http://netcdn.tw/app/835599320/tiktok-likes-free-game-hack' is flagged as a known malicious redirector. The document body also contains text related to this lure and a call-to-action phrase, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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/835599320/tiktok-likes-free-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_off000022aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AA 23536 bytes
SHA-256: 6c63d483bae6043e8014afde9fb30373b1efe5f8aac0be86c86b7d2ccdb3a60a
font_01_sfnt_off000057dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 17456 bytes
SHA-256: 6bc07a916d4e04dd857b15fc22f6a85a1633f574b63a4730ea8dc15634c660b5