Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3e90ef803216d7…

MALICIOUS

PDF

30.9 KB Created: 2021-07-19 08:51:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 38d05ee77e09ba23daa93896d15f6168 SHA-1: 9869d7e9495818e210950db2ca8c5fcc6b2b124b SHA-256: 5f3e90ef803216d779b0d3edefb0bcfeb7f07b61387fcc75f40a9426f062ee22
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Free Coins 2021 Game Hack'. The document body also contains similar lures and a call-to-action phrase, suggesting a phishing or scam attempt. The primary function appears to be redirecting the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0457

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/406889139/coin-master-free-coins-2021-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_off000024e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24E5 22712 bytes
SHA-256: be7c0322a0ec970b23bd15c857e3266e5d01a2efd34b78a219c813644777b7a0
font_01_sfnt_off000057ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57CE 18112 bytes
SHA-256: d3290bf375094f68ca2c73f068de3958d05aa7629a05aa779b6fc584462feea2