Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32b38c26a66b939…

MALICIOUS

PDF

28.7 KB Created: 2021-07-21 05:31:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9200c1330cc681f82405e85447752236 SHA-1: 1c56195fa9fe2e0a20f5e4fbfb9c0aff9c1c5c90 SHA-256: c32b38c26a66b939dd65ba71c5884ca9d92475f258d2afda2816bca346a81d73
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, specifically linking to 'http://netcdn.tw/app/835599320/free-tiktok-followers-game-hack'. This URL is also flagged as known malicious infrastructure. The document body reinforces this by displaying 'Free Tiktok Followers' and a 'CLICK HERE TO ACCESS TIKTOK GENERATOR' call to action, indicating a social engineering attempt to trick users into visiting the malicious URL, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0319

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/835599320/free-tiktok-followers-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_off0000224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224D 21136 bytes
SHA-256: 81b4ab43c0086031126b121dd9841548ed1953301b54601b6e6792a9df3bac3e
font_01_sfnt_off00005031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5031 17692 bytes
SHA-256: ba2215a0f2290c6faad19fe6968ba231152e54b1cb241ca137cf69db350684c8

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