Malicious PDF — malware analysis report

Static analysis result for SHA-256 c894b03fc69d4e8c…

MALICIOUS

PDF

34.7 KB Created: 2021-05-25 09:32:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 176f98a78417ac04bb813aeadf00bc0c SHA-1: 82d08baa8cecc865431cf7702886078a309bcd3b SHA-256: c894b03fc69d4e8c793add444cd998c7a18055e2133947957d25e76bec214fca
130 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a lure for malicious redirectors, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/835599320/hack-tiktok-fans-free-game-hack, is flagged as malicious. While no scripts were directly extracted, the PDF structure and lure suggest an attempt to exploit vulnerabilities or trick the user into downloading a payload, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/hack-tiktok-fans-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
stream_002_off000028a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28A7 28856 bytes
SHA-256: a2423aeb6d65d42ffca8f83784fc156834dd5970703f01ec9ab05f5535bbb6a1
font_01_sfnt_off00006884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6884 17684 bytes
SHA-256: 3b18324811ff9b2016b67c954de883c0131a9d703a91aa0a24a49898f2a8c27e