Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cb38f4c0c220cc…

MALICIOUS

PDF

27.3 KB Created: 2021-07-06 10:10:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 506a540026ac7173129e0a6509ad125b SHA-1: e35ea1d6b68776174e31cba2847abd9b355fc0c9 SHA-256: 99cb38f4c0c220cc404607e2d85b190c158d48fdfef1dec19e4d5fb0b6faaf59
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links pointing to a known malicious redirector, masquerading as a 'Free Robux Generator'. The document body text reinforces this lure with phrases like 'CLICK HERE TO ACCESS ROBUX GENERATOR'. This indicates a phishing or scam attempt, likely to lead the user to a site that will attempt to steal credentials or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0522

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-generator-com-roblox-hack-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654 21740 bytes
SHA-256: 04d7c2bb13dc4199b340b8ad5fc538c2cad5c2252c47f0e0f024346f8cc08934
font_01_sfnt_off00004618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4618 19324 bytes
SHA-256: b5fe64a349a1260a8bf1e39cb434a35d84e03f20b24c2703f62dd6d7df3547b9

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