Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ed475acbafb6a3…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 05:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8a0c3379802c1b7f30c53e1aa7b4c99d SHA-1: 87c03e83195dc71b2212f36c875ee2c9f611eb5d SHA-256: 72ed475acbafb6a3b9107a3a44e4492f0d86b060ebcd4a36d11f583880740933
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. The presence of a fake CAPTCHA lure strongly suggests an attempt to trick the user into clicking these links, likely leading to a malicious website or download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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 https://netcdn.xyz/app/431946152/robloxhacks-game-hack
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-can-you-get-robux_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/rblx-gg-free-robux_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/win-free-robux_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-tricks_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/reddit-coin-master-hack_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-blogspot_GM406889139.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/games-to-get-free-robux_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/apps-for-free-robux_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-hack-no-survey-or-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004877.bin
48b1c84fda742a3c286b8df7d4c3a129c20ad75f47575fff8ccb11ccd9aa3c5f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4877 24992 bytes
font_01_sfnt_off0000817b.bin
4c82b5acf2344fb6074e769b7bb8f458d53ebd76102ce4f277dd7245c06f6447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x817B 18348 bytes

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