Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a99b1f6cb52fcb…

MALICIOUS

PDF

37.1 KB Created: 2021-05-22 21:35:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 02023a32fe9325a2cbab197c6e8b9afd SHA-1: f9579f708107dd0392a20db9459672a470d899c8 SHA-256: 25a99b1f6cb52fcb126e3c198c393d818bbc7406c80f0697a55abbfd81b2a24b
200 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 and scam websites, specifically advertising "free Robux" and "game hacks". The document body explicitly contains the URL 'https://netcdn.xyz/app/431946152/free-robux-scam-game-hack' and a call to action to 'CLICK HERE TO ACCESS ROBLOX GENERATOR'. The presence of a visual download button lure and instructions for a password-protected archive further suggest a malicious workflow designed to trick users into downloading or accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/free-robux-scam-game-hack In PDF document text
    • http://nonogos.com/images/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://nonogos.com/images/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://nonogos.com/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://nonogos.com/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://nonogos.com/images/multiplayer-master-hack-coins_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
stream_002_off0000323d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323D 27560 bytes
SHA-256: 1cda7158c4064325f8ae2d496a0be5106922ffb540537b0def3a8a46cc127527
font_01_sfnt_off00006f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 18500 bytes
SHA-256: 24c52a02bd601b0a5cf869202747d5c16280e540771a7d3b3f68f33a5cbf68e3

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