Malicious PDF — malware analysis report

Static analysis result for SHA-256 38972ebbc46500c0…

MALICIOUS

PDF

49.8 KB Created: 2021-06-09 00:51:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d12e25d56f7eaa882b8f33c772c932ff SHA-1: 8734316dabc69ac4966c5451a9a389444cd06ade SHA-256: 38972ebbc46500c00a95cb379d08a4a02d631b24978412cb495d908b9ee091f5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick users into interacting with the document. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-dupe-hack-game-hack
    • http://brokermortgages.com/images/roblox-land-free-robux_GM431946152.pdf
    • http://brokermortgages.com/images/free-spins-coin-master_GM406889139.pdf
    • http://brokermortgages.com/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • http://brokermortgages.com/images/coin-monster_GM406889139.pdf
    • http://brokermortgages.com/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://brokermortgages.com/images/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://brokermortgages.com/images/hack-coin-master-no-human-verification_GM406889139.pdf
    • http://brokermortgages.com/images/free-roblox-accounts-with-obc-lifetime-2021_GM431946152.pdf
    • http://brokermortgages.com/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://brokermortgages.com/images/coin-master-hack-apk-33-download_GM406889139.pdf
    • http://brokermortgages.com/images/free-card-giver-roblox-jailbreak-2021_GM431946152.pdf
    • http://brokermortgages.com/images/coin-master-free-link_GM406889139.pdf
    • http://brokermortgages.com/images/robux-free-script_GM431946152.pdf
    • http://brokermortgages.com/images/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://brokermortgages.com/images/free-robux-obby-2021_GM431946152.pdf
    • http://brokermortgages.com/images/how-to-get-no-cooldown-hacks-in-roblox_GM431946152.pdf
    • http://brokermortgages.com/images/free-spin-coin-master-ios_GM406889139.pdf
    • http://brokermortgages.com/images/robux-com-free_GM431946152.pdf
    • http://brokermortgages.com/images/free-coin-master-gold-cards_GM406889139.pdf
    • http://brokermortgages.com/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000529b.bin
b6641fbbf89f2aab6e4c517684c0ba54ff67116198c870e14b02d56c184d8f70		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529B 27468 bytes
font_01_sfnt_off000091d0.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D0 5696 bytes
font_02_sfnt_off00009ee2.bin
5dfd207663b43f53c00a080c28a1a8f17e593a328fcb37281c96b0b0f3f192aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE2 18664 bytes

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