Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b3804d63590fc…

MALICIOUS

PDF

33.5 KB Created: 2021-07-07 23:14:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8d47c0c3006b57598b3dfaed93840f6f SHA-1: db59094c7d16e19ccf1e07d1e6678afaaa92a187 SHA-256: 8d4b3804d63590fc1ae9270dc537b8f4b1566c11738393b815ca2d956d9b60a3
82 Risk Score

Malware Insights

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

The document presents a lure for free Robux, a common tactic for scams and malware distribution. It contains an embedded URI pointing to a suspicious domain, and heuristics indicate it's a browser extension/update installation lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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/431946152/how-to-get-free-robux-promo-codes-game-hack
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-tiktok-likes-without-verification_GM835599320.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/roblox-hack-free-robux-no-human-verification_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/roblox-place-rewards_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-minecraft-skin-maker_GM479516143.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-email-rewards-link_GM406889139.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/blogspot-coin-master-spins_GM406889139.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/roblox-skins-hack_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/hacks-for-roblox-download-pc_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/robux-for-surveys_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/roblox-how-to-get-40-robux-free_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-robux-real_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/hack-menu-roblox-jailbreak_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/best-free-hacked-client_GM479516143.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-mod-version-free-download-2021_GM406889139.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002cac.bin
685856c8efd12dc0bf04e0abfcb0186adeb7d1125b8d644127a79ca3e78d8747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAC 21848 bytes
font_01_sfnt_off00005cd0.bin
0dadee5e3cc3b2abbaca990777016bf93155e721bdd32ff7d925edbe6cadea8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD0 19572 bytes

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