Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebfec6e242e8855…

MALICIOUS

PDF

29.9 KB Created: 2021-07-19 08:21:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3232429c4563e7eebeffef18c49c36d2 SHA-1: bf2eaf7f8948514673fa2524f6750cd37a17ea5f SHA-256: 2ebfec6e242e88551831bd2cd6996cc6648de66d2c4e29c189fd3b8493d06092
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or 'game hacks'. The document body also contains similar lures and directs users to download related files. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be social engineering via a phishing lure, leading to potentially malicious downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

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/431946152/free-robux-games-on-roblox-game-hack In PDF document text
    • http://balibetonmandiri.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://balibetonmandiri.com/new/public/ckfinder/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn 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_off0000220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220C 21664 bytes
SHA-256: e67702316ab605994535bfab68e48e92c7c8d3963a001d9aed2b2e388b00eacc
font_01_sfnt_off000051cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51CD 18760 bytes
SHA-256: 65395852f51328f21020b285fd6331685a38244f4ff4cff0d8f1f88ee3e20e2d

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