Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a348fcbcd4a2e9…

MALICIOUS

PDF

227.5 KB Created: 2021-07-09 06:06:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a4d7242a29e1b36779c487583e49c59a SHA-1: 80a93bbb641262c3b865ae97ccf6c6d40e50e221 SHA-256: 87a348fcbcd4a2e95751fa26951f8cf0855b276089e0d719c7066df48991b130
132 Risk Score

Malware Insights

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

The file is a PDF that presents a fake CAPTCHA and a call-to-action button, aiming to trick the user into downloading a fake application or update. It contains an embedded URL pointing to a suspicious domain, likely serving as the download source for the malicious content. The document body, though heavily obfuscated, contains references to 'Pokemon Go Free To Download' and a URL that aligns with this lure.

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/pokemon-go-free-to-download-game-hack
    • http://lib.kunci.or.id/repository/robux-gainer_GM431946152.pdf
    • http://lib.kunci.or.id/repository/roblox-free-robux-wivout-paying_GM431946152.pdf
    • http://lib.kunci.or.id/repository/roblox-imagine_GM431946152.pdf
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://lib.kunci.or.id/repository/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://lib.kunci.or.id/repository/roblox-e-free_GM431946152.pdf
    • http://lib.kunci.or.id/repository/free-tiktok-followers-app_GM835599320.pdf
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-computer-only_GM431946152.pdf
    • http://lib.kunci.or.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://lib.kunci.or.id/repository/free-ninja-suit-roblox_GM431946152.pdf
    • http://lib.kunci.or.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdf
    • http://lib.kunci.or.id/repository/roblox-games-free-play-now_GM431946152.pdf
    • http://lib.kunci.or.id/repository/robux-hack-para-android_GM431946152.pdf
    • http://lib.kunci.or.id/repository/free-robux-site_GM431946152.pdf
    • http://lib.kunci.or.id/repository/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://lib.kunci.or.id/repository/minecraft-windows-free_GM479516143.pdf
    • http://lib.kunci.or.id/repository/instagram-coin-master-free-spins_GM406889139.pdf
    • http://lib.kunci.or.id/repository/roblox-free-robux-codes_GM431946152.pdf
    • http://lib.kunci.or.id/repository/free-robux-obby_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off00032159.bin
b32f7bc1507e5c994546f7121089bf893f0d85fd7503e40c877dac6d0735799c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32159 25576 bytes
font_01_sfnt_off00035d5d.bin
70e793dc693306459a16c726033e70cc76d70bcb60e36445740650f3b1db1f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35D5D 18940 bytes

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