Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dd3c428a045eb2…

MALICIOUS

PDF

36.2 KB Created: 2021-05-10 12:43:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c258f6772d59cba0df2ed3f8a080162a SHA-1: b3d8d2d75b6bcf36de891a4a93dcd30ec6be7e84 SHA-256: c5dd3c428a045eb218a53b14f3b738a7ee873f44042f7b6e51e3d3c966f08965
92 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0303

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/406889139/how-to-get-free-spins-on-coin-master-2021-iphone-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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
stream_003_off00003416.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3416 24396 bytes
SHA-256: 75171e5b870c30caf853f3691c31411d87e1f3fcc28fcfd813018364b84a009f
font_01_sfnt_off00006b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5D 18620 bytes
SHA-256: 40c475c53aff331210a9a2d0b75aea6a35c2112271575a9f9d5a0db1381ffa81

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