Malicious PDF — malware analysis report

Static analysis result for SHA-256 257048a3e84dcdce…

MALICIOUS

PDF

49.9 KB Created: 2021-06-03 05:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 41b7111927282e34e10ed0a2c661d221 SHA-1: c93c4d1ea8c9ce3181b5f5f9b6d1a5ad065182ee SHA-256: 257048a3e84dcdce627398897c8ea1aeafd532877a58b4d07465ef53a2465016
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 a call-to-action button, directing users to a URL that likely hosts a malicious payload. The ML classifier strongly flagged this PDF as malicious, and the embedded URL suggests a phishing or scam attempt. No scripts were extracted, but the presence of a fake CAPTCHA and external URL indicates an attempt to trick the user into executing a malicious action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/earn-robux-sites-game-hack PDF link annotation
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bundadelimalampung.ac.id/repository/how-to-install-minecraft-for-free-on-ios_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_004_off0000504e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504E 36500 bytes
SHA-256: fb597c3f2d653daba11a99ba2081e6e4aaf124a7d650b0a411004ece5c40a88d
font_01_sfnt_off0000a0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D7 18300 bytes
SHA-256: 9e3af24e52ef4cb9fc4b51a762cd65285bc4813e2d9c15cd1a5337b0fae4df73

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