Malicious PDF — malware analysis report

Static analysis result for SHA-256 431d87d406ed0337…

MALICIOUS

PDF

35.3 KB Created: 2021-05-10 11:12:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9ed13bcc7511fa45dff91c98707f0a26 SHA-1: bb4afe7578abfb85ff4fe907dec0678f665b5572 SHA-256: 431d87d406ed03376b2ec579a73dfa3f4592f1e5662ce2538d480779882f2afe
92 Risk Score

Malware Insights

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

The PDF document contains a link that purports to be a 'free generator / game hack' for Roblox, which is a common lure for malicious content. The document also displays a fake CAPTCHA or human verification prompt, designed to trick users into interacting further. The primary malicious URL identified is https://netcdn.xyz/app/431946152/kuso-icu-roblox-hack-game-hack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/kuso-icu-roblox-hack-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_off0000313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313E 24224 bytes
SHA-256: c4d042f6d0695e41cf549ce7bdd1100aea6b59e3be69aeb2d1a4c19568573ef7
font_01_sfnt_off00006810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 18320 bytes
SHA-256: 67b96beca271d5ff8db6d4205f4bcb305d403275eb03eb731bd8bb208d3be0d2

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