Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a5899ce0d65400…

MALICIOUS

PDF

250.5 KB Created: 2021-07-08 07:20:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0b92953059be659c7877501eaf34d56e SHA-1: 9233bfb34cc4c3d1e33697f59356b8dba8124b98 SHA-256: 71a5899ce0d654003bcb5de2f83c01f16a52fdf3852ae33be121c722a9a7abbf
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1555.003 Credentials from Web Browser

The document presents a fake CAPTCHA and advance-fee scam lure to trick the user into clicking a download link. The presence of MFA/one-time code harvesting lures suggests an attempt to steal credentials or session tokens. The embedded URLs point to potentially malicious content, likely a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-image-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-apk-hack-32_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-spin-hack-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/aimbot-download-free-roblox_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coinmaster-hack_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-avatar-animations-roblox_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/spicy-peanuts-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/apps-for-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-no-downloading-anything_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-more-robux-hack_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-34-5-hack_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/gainbloxcom-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/blogspot-coin-master-spins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-blog_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00037dc4.bin
c43e49a1a73d3eeae6b2137c22e12f61d4093bfdb9dd13a30824a79d8bcf7975		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37DC4 25928 bytes
font_01_sfnt_off0003bae1.bin
65287014e59cce31a84eb3a96857095cd9450bdb3b6fe5f269afca0176d2a55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BAE1 18388 bytes

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