Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cdaf2ec51287e4…

MALICIOUS

PDF

36.0 KB Created: 2021-05-23 02:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 331bae0165cafd3b982f580207d52f45 SHA-1: f2d31040183fd0c538e2b991b40fe11752469fa9 SHA-256: 98cdaf2ec51287e4431b919b1db8c16a9cb3879d2a99bc51913fd5a274808c5d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator' for TikTok coins. The presence of a call-to-action button further supports the lure. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0078

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/835599320/how-to-get-free-coins-on-tiktok-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002b3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B3F 24484 bytes
SHA-256: ff7257604e29960a8b6b6e797f5a4a1c4ea4f517132b1c7878c4a9b791cbf83c
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00006d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D27 17620 bytes
SHA-256: a70420454de2d0aac39539e39c590a982a6360a54609316ad93aa98ab536d9bf

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