Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb57c5a624cb593…

MALICIOUS

PDF

30.5 KB Created: 2021-07-19 07:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70ee05f1211f5ca94cb9d36272091873 SHA-1: 38acf6b3fd73bc2c06b237eb932f8fe7e9183362 SHA-256: 2cb57c5a624cb593c9dbc166096d2d30474d5f8412acd3fc3b7da0251d4c716b
130 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it links to a malicious redirector disguised as a 'free generator / game hack' for TikTok followers. The embedded URL directs to a known malicious infrastructure, suggesting an attempt to lure users to a potentially harmful site. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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/tiktok-followers-for-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_off0000245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245A 22852 bytes
SHA-256: f15484732c13580910746323abbe5f549a0405747572f2fd7796330a850d26c3
font_01_sfnt_off00005778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5778 17692 bytes
SHA-256: 1b1e1c30a9592b0fb91196253d93c27419259905b41c1e14a3654a7d7056ebb4

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