Malicious PDF — malware analysis report

Static analysis result for SHA-256 3894e0945552c272…

MALICIOUS

PDF

50.3 KB Created: 2021-06-11 06:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cd7caac7a9fcafcad7c843a10c63e7c9 SHA-1: aacb14ae87e2a5a79d3cd9876e5c9f30449d0746 SHA-256: 3894e0945552c272689e53c7bb72e2f5f201c91e1a4bb3acbf10f46b926bf8b7
82 Risk Score

Malware Insights

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

The PDF file contains a high-confidence machine learning detection and a heuristic indicating brand-impersonation credential phishing, specifically impersonating 'outlook'. It presents a visual download button lure, directing users to a URL hosted on 'netcdn.tw' which is unrelated to the impersonated brand. This suggests a phishing attempt to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.tw/app/431946152/www-roblox-com-free-download-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.tw/app/431946152/www-roblox-com-free-download-game-hack PDF link annotation
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/get-more-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/easy-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coins-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/mcpe-client_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BB 27584 bytes
SHA-256: 8c7aecc659ec1abb986e985b96acc88083a68233865a81aa489ac8c1dae8e01e
font_01_sfnt_off000092ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F72 19140 bytes
SHA-256: ce9921decb52afa7bae56c673d0f9a69329b134de7daefc1ed8bb25327ddbaed

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