Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1c081a522d148…

MALICIOUS

PDF

36.4 KB Created: 2021-05-21 02:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e26431a665951c8e85bff0a651eece7a SHA-1: 6a0060597c12f86df7ae4d8d30451f92f1d47878 SHA-256: d8d1c081a522d14867770dd50d45b2d6a8ccdab793159e2edfe2462bd764451e
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick users into downloading further content. It contains multiple embedded URLs, with one prominent URL pointing to a resource related to 'free-minecraft-packs-game-hack', suggesting a lure for game-related cheats or exploits. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/free-minecraft-packs-game-hack PDF link annotation
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/pokemon-go-free-year_GM1094591345.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.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_off000035a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35A4 24804 bytes
SHA-256: 83912e0191a17024db2cf9868c52486efbfc27a8e405ae376a97a7a0a9bf1876
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 17892 bytes
SHA-256: 25239530904106c80f39e3701b03422c9327d7e820d7c0c2c5fcca61992c3eb7

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