Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2fe1443132859c…

MALICIOUS

PDF

39.2 KB Created: 2021-05-24 05:04:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 73a0937e8e3309ab8f6abf5117e0458d SHA-1: 10dc7e01e3ea5316254a3fe1746bfaaa5d2a5834 SHA-256: 4e2fe1443132859cd651ec21edac0eb783927a9223a0fc40409f341a6d3b04f4
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 malicious score 0.9476

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/479516143/free-printable-minecraft-coloring-pages-game-hack.
  • 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/479516143/free-printable-minecraft-coloring-pages-game-hack PDF link annotation
    • http://kukuck.de/images/when-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://kukuck.de/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/roblox-hack-unlimited-robux_GM431946152.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_off000034e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34E9 29824 bytes
SHA-256: f31ecd6f00783cb65b03305574236c88e631a02c3453fa8d093ba602366aeabd
font_01_sfnt_off00007826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7826 18384 bytes
SHA-256: b54cebd8b2bbc40deba01da3a93219bb66384243215780ac353a5f98c97c66c1

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