Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cf3c0e176d5f04…

MALICIOUS

PDF

31.7 KB Created: 2021-07-18 22:59:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81bef100737c5c17e227eedfc89eca4a SHA-1: bf503340a34a6a12ba5376358ea808e111761611 SHA-256: 88cf3c0e176d5f0445ddb9d10c9ea717ef3055a845030b8a3ab6be29af680a16
130 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector URL, identified as malicious infrastructure. The document body and embedded text explicitly mention 'Free Tiktok Followers' and 'CLICK HERE TO ACCESS TIKTOK GENERATOR', indicating a social engineering lure. The heuristic firings confirm the presence of malicious redirector links and a lure for a 'game hack'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0622

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-without-verification-game-hack In PDF document text
    • http://phenomventures.com/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_off0000243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243C 23652 bytes
SHA-256: ac405c0bcab200e3c23d3a603105dd348f34ca00896e3bf472fa4bc9d6eb1db1
font_01_sfnt_off000059f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F7 18560 bytes
SHA-256: 4328f2d9021fda272d6942102c30ad90396447c40598e55ae21b07e1aa723a10

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