Malicious PDF — malware analysis report

Static analysis result for SHA-256 d439b16bea1a03ff…

MALICIOUS

PDF

40.4 KB Created: 2021-04-24 01:46:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3b23ab1d0729cfa28fa215205e11baa SHA-1: dde5938bc9833e5645353685efac5c042d7be848 SHA-256: d439b16bea1a03ff90b55b2fdfa85b90d5f49ebf9c44c49fd45e50146bd09074
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9941

Heuristics 4

  • 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.
  • 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://netsecure.top/app/431946152/how-to-get-free-robux-apple-ipad-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-website-bloxburg-sign.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/soros-italian-restaurant-free-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/gameclub-roblox-hack.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-use-command-prompt-to-hack-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-2021-xbox-one.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/auto-clicker-for-roblox-mac-free.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-seaside-cheat.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-catalog-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-roblox-membership-for-free.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-games-roblox-games.pdfIn PDF document text
    • https://www.semrush.com/prices/In 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_003_off0000425e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x425E 24316 bytes
SHA-256: cf589efd697899fdcf9582f9d32ad7c392754ba3a55c4f11bc6ba243113cb30c
font_01_sfnt_off00007a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0B 18932 bytes
SHA-256: c5f20dfe80aaa10d358b737a77c628ea28bc8088405b8189fd7a9b1c6fd360a2

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