Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca1a3244b0583f8…

MALICIOUS

PDF

36.0 KB Created: 2021-05-20 20:35:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1840172ef07771f060c762ad12941804 SHA-1: a8137bacf7487c5b6bd9848f2c361f0a3e878fa7 SHA-256: 6ca1a3244b0583f88d9b097dabca8e8ad8de9d5acdb27ce2207461ec0fe2f50c
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a lure for a 'free generator / game hack' which redirects to a suspicious URL. It also explicitly requests recovery secrets or private keys, indicating a phishing attempt. The primary IOC is the malicious URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/free-draw-2-roblox-game-hack PDF link annotation
    • 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_off00002dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC7 26960 bytes
SHA-256: 868ff66b79fb67f3f6a763f5d46dc6ed3c06270e4dcc78747e50a11828fff012
font_01_sfnt_off00006aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA4 18632 bytes
SHA-256: 1948321e46036ef7a86fce7363c42741d482fdecd1af70e946b235d8b00c49b1

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