Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9cf9953f280477…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 15:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b975f2d1830441c3c211af7e072b2c03 SHA-1: 8e3756797b4abe29188a7b0b2e45a0f7d8e10847 SHA-256: ef9cf9953f2804773d409e0b0bf0526e5052adfcd58918398eb7130fba2693ab
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA and includes a prominent link to 'free-robux-for-free-game-hack', strongly suggesting a lure to trick users into downloading a malicious payload. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence indicate malicious intent. The document likely serves as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-robux-for-free-game-hack
    • https://bancroftandsons.com/images/coinmaster-twitter_GM406889139.pdf
    • https://bancroftandsons.com/images/free-robux-live_GM431946152.pdf
    • https://bancroftandsons.com/images/roblox-no-download-hack_GM431946152.pdf
    • https://bancroftandsons.com/images/free-shirt-templates-roblox_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-gold-cards-hack_GM406889139.pdf
    • https://bancroftandsons.com/images/install-free-game-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/free-spins-coinmaster_GM406889139.pdf
    • https://bancroftandsons.com/images/roblox-gift-card-online-free_GM431946152.pdf
    • https://bancroftandsons.com/images/get-free-spins-on-coin-master_GM406889139.pdf
    • https://bancroftandsons.com/images/roblox-gift-card-for-free_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://bancroftandsons.com/images/robux-com-free-robux_GM431946152.pdf
    • https://bancroftandsons.com/images/coin-master-firebird-card-free_GM406889139.pdf
    • https://bancroftandsons.com/images/minecraft-life-hacks_GM479516143.pdf
    • https://bancroftandsons.com/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://bancroftandsons.com/images/roblox-hack-codes_GM431946152.pdf
    • https://bancroftandsons.com/images/how-to-get-free-roblox-items_GM431946152.pdf
    • https://bancroftandsons.com/images/irobux-com-redeem_GM431946152.pdf
    • https://bancroftandsons.com/images/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://bancroftandsons.com/images/free-robux-generator-for-kids_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049b2.bin
57cd4fe7897675a52be6ae67634cc1ffb4381a16b2b7608852366b5b86e20dd2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B2 24516 bytes
font_01_sfnt_off00008225.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8225 18012 bytes

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