Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3b3c2e560bc6a2…

MALICIOUS

PDF

226.8 KB Created: 2021-07-05 22:26:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 22e11d1e726196adfdd1a56544ca2772 SHA-1: 6a7c699ea86de8bd407535ba2d9d22c5f7461492 SHA-256: 0c3b3c2e560bc6a28dadd61cf712e3145eb365c923a97f9150836a7a527b403d
132 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it presents a fake CAPTCHA and a download lure, aiming to trick users into installing a browser extension or update. The document body, though heavily obfuscated, contains a URL that aligns with these social engineering tactics. The primary attack pattern observed is a lure to install potentially malicious software.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/is-pokemon-go-free-on-nintendo-switch-game-hack
    • https://bwsrubber.com/image/data/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/free-robux-cards_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://bwsrubber.com/image/data/files/roblox-script-executor-free_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/free-sound-id-roblox_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/free-robux-just-click_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/well-hack-net-roblox_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/worst-client_GM479516143.pdf
    • https://bwsrubber.com/image/data/files/minecraft-aimbot_GM479516143.pdf
    • https://bwsrubber.com/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://bwsrubber.com/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/hacks-como-conseguir-robux-gratis_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/minecraft-windows-10-free-code_GM479516143.pdf
    • https://bwsrubber.com/image/data/files/blogspot-coin-master_GM406889139.pdf
    • https://bwsrubber.com/image/data/files/how-to-free-robux_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • https://bwsrubber.com/image/data/files/coin-master-free-gold-cards_GM406889139.pdf
    • https://bwsrubber.com/image/data/files/2021-free-coin-master-spins_GM406889139.pdf
    • https://bwsrubber.com/image/data/files/free-robux-donation-group_GM431946152.pdf
    • https://bwsrubber.com/image/data/files/get-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off00031e42.bin
7d7990b55727c68a5f80950e624319a5022e3f5303f9110d9362282403ce2489		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E42 25576 bytes
font_01_sfnt_off00035a50.bin
6f961619c0b6dfa391ada9f8ff96f087f439a8ad9365d3b14c1389e775bcb2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35A50 19084 bytes

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