Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c72c97efb34eaf…

MALICIOUS

PDF

37.0 KB Created: 2021-05-21 10:09:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5bed3c4efe711d8e7529ea48442b2ed SHA-1: 0b55fa3c787802ca51a4485a6e604752215a076a SHA-256: 99c72c97efb34eaf46166cc869f603b90bd0b69cc79aa254282339e9d09718ef
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'Free Tiktok Video' and 'game hack' generators, directing users to a suspicious URL. This URL is flagged as a malicious redirector, indicating a phishing or scam attempt. The document body and heuristics confirm the presence of embedded links designed to lead the user to this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/free-tiktok-video-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_off0000280a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x280A 27372 bytes
SHA-256: 4a78ff324dffa8e98bf4c9471e86633a20ce7aa57ca708574e69587eb2b79350
font_01_sfnt_off00006699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000070a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 17764 bytes
SHA-256: 235ab7ad76fbd6febe16a9da060cefd2b4630fdfb887c9c84e88c01a352496ee

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