Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba02e4539eadef…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 01:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8cf09ef7bf5185709dcbca145e50ec6f SHA-1: 1edc4e1c16df4caeb76bd98d7cf737d569f0dbb4 SHA-256: 3cba02e4539eadef7cbda08bf779744e71e80827ac6d761cd6846da178499cb8
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, a common social engineering tactic. It contains an embedded URI pointing to a URL that likely hosts a malicious payload. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the fake CAPTCHA heuristic suggest an attempt to deliver a second-stage exploit or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-daily-free-spins-link-today-2021-game-hack PDF link annotation
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-a_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-apk-android_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_003_off00004b06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B06 29300 bytes
SHA-256: e4842e73a9dcc848c9ef83e68e52838a73f14596a24e873583643b06eebd9f58
font_01_sfnt_off00008882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 19052 bytes
SHA-256: 51ec1fd699785aa8f843f12306ac352f9679003eb9b4544ea09afbac11be1d71

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