Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a355dec1b97c0…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 00:16:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0149e4db9648560406d12da8290b1c9d SHA-1: 1685cfef4b48b0dafd33f1cf2c1a6fb77e34b0dd SHA-256: 933a355dec1b97c08d4960acd7a7af3adc5d182754a2cd92f239aa331b5f5e2e
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and embedded URLs, indicating a social engineering attempt to trick the user into downloading a payload. The ML classifier also flagged the document as malicious. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-apk-hack-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-android-no-root_GM406889139.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_off000033b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B8 26104 bytes
SHA-256: 4b66df6c06bc95c590359a0effa0c56bcea32bb34d8acf3bb73e949385c63b0b
font_01_sfnt_off00006ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBD 18356 bytes
SHA-256: 7e836b6261bebb63fda2bc6c603fa398fe0a548bc6334e21915c3f4956160db8

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