Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c4ed9b09233773…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 11:42:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ba9472fe48adf1618f1ba7f6214e6ed3 SHA-1: 15887b0e554d010cb3857a9f21ffa5e7c2e40401 SHA-256: 47c4ed9b0923377315657c8bec5940f5fc102f9bb8a08cd2cc3054166902c03b
90 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds external URIs, including one pointing to a potential download hosted on netcdn.tw. The ML classifier also flagged this PDF as malicious. These factors suggest the document is intended to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/roblox-robloxian-2.0-free-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-donloaden-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-1-coin-master_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_004_off000052a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A9 24656 bytes
SHA-256: 30f6ea7af7e8ce19c49d38a8530d6477f019ca23e629a8dd068c736c1075b833
font_01_sfnt_off00008b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4F 18660 bytes
SHA-256: 9fe7c76c898060f86fe34785b631603afe39a56cc39984feb8b3ff8a5bb55ad1

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