Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ee241e9bff9d19…

MALICIOUS

PDF

42.5 KB Created: 2021-04-23 22:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 133395447486b5c3df749606a8b0a0a2 SHA-1: f349ed3b8e3cb85275a47d76a5dd3b5092a3fa9d SHA-256: d4ee241e9bff9d1922dda82b78a751f8df395a2b2d1d10a4acbabb65815c7063
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a security-bypass 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 malicious score 0.9941

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/comment-avoir-un-cheat-sur-roblox-franais-gratuit-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-phantom-forces-aimbot.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-other-roblox-accounts-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-a-account-roblox-v3rm.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/free-robux-website-bloxburg-sign.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-btool.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/roblox-backdoor-gamez-to-hack.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-how-to-get-free-robux-june-2021.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/bloxburg-roblox-hack-2021.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_off00004306.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4306 27428 bytes
SHA-256: 792de081a93d4a43197a42fedb9b0d93515c2c0611f22fff53e22a633834a61b
font_01_sfnt_off000081e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E8 19264 bytes
SHA-256: a0a3e748663296ae34ba20f2a60aecd5cdd3d5838bdcd49ca7769f6209211011

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