Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2a839420e52cef…

MALICIOUS

PDF

227.2 KB Created: 2021-07-06 12:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4284d6b3f67d9d95e138e4cad10673c4 SHA-1: 073856fbfe51b075c4e387035a2783f6a0892576 SHA-256: 4b2a839420e52cef0a6bc7b09eec9aae3149de0ed278730f728ec3a17a06412f
132 Risk Score

Malware Insights

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

The document employs social engineering tactics, including a fake CAPTCHA and a browser extension installation lure, to trick users into downloading potentially malicious content. The embedded URLs, such as http://netcdn.tw/app/1094591345/can-pokemon-go-free-account-game-hack, likely lead to the execution of further malware. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to deceive the user into downloading and executing further payloads.

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/can-pokemon-go-free-account-game-hack
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/boost9-com-roblox-hack_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-minecraft-skins-pe_GM479516143.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-offers_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-stream_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-fly-hack-bit-slicer_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-free-gamepass-on-roblox-phone_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-free-spin_GM406889139.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-script_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-hack-without-downloading_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/can-i-get-robux-for-free_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-hack-roblox-and-get-free-stuff_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/robux-matchcomfree-robux_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-ro-hero-academia-hack_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/robux-page_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/how-to-get-dominus-items-for-free-roblox_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/www-roblox-com-robux-free_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/roblox-hack-extension_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-coins-for-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_off00032147.bin
93c0fc5b1a79a73f4810e41f1c8330e1e8d6fb9d536469abf5cf0457c66e5488
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32147 25728 bytes
font_01_sfnt_off00035d73.bin
cd660e0cf2974514a5990f07531734793aaf2979ae5296be6676435b6ac71265
pdf-font-stream PDF embedded font (sfnt) at offset 0x35D73 18604 bytes