Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4c8127a504dd79…

MALICIOUS

PDF

39.4 KB Created: 2021-05-10 10:31:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f4d5b47f2f684e823bbe70cc813259f6 SHA-1: 2a78f96081a770b9615f6c64ea23f0613ff4d3a8 SHA-256: 2c4c8127a504dd799cb7bf6bda5f880fb89af3d0d343a81d0bb8bee9bcd102b1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to a known malicious domain, masquerading as a "Coin Master Free Spins Link 2021" and offering a "generator" or "game hack". The document body and heuristics indicate a social engineering lure designed to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/406889139/coin-master-free-spins-link-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000352f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x352F 24196 bytes
SHA-256: 4832347d5b906fa28ffbf8cbe7e04eb32a56a605ce92ea5c4ad20b1cf0cab6b1
font_01_sfnt_off00006be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE8 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off000077d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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