Malicious PDF — malware analysis report

Static analysis result for SHA-256 c341e48bd7b00913…

MALICIOUS

PDF

41.2 KB Created: 2021-04-26 19:16:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a6e9e6225b5c05b76a0a4ef82429483f SHA-1: 955bd1d195a951afeb9e1a500a337916fe07c329 SHA-256: c341e48bd7b009138167f8ef5f7a4cee02341ed99d8981b63f416f507c5aed46
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://netcdn.xyz/app/431946152/speed-hack-roblox-without-cheat-engine-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-quick-and-easy-no-hastle.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/bloxburg-roblox-hack-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-hacks-admin-commands.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-account-roblox-obc-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/money-cheats-for-rocitizens-on-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/multi-tool-hack-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-earn-free-robux-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-aktualisieren-free-download.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hacks-para-infinity-anime-roblox.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-generatorcom-pc.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_003_off00003ee7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EE7 26312 bytes
SHA-256: 7a462d8fd01cb87be53870de40ccb8579c925fdab08bc0c8920bc5f42319eb4d
font_01_sfnt_off00007b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B52 19548 bytes
SHA-256: b0e65549f34d3d6d621dc1dfb9538039289f5ec14e2326c7726377d4dcd2bbfc

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