Malicious PDF — malware analysis report

Static analysis result for SHA-256 120a631924982835…

MALICIOUS

PDF

45.1 KB Created: 2021-06-08 22:08:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: be157bdf84d9d6914818d356785130ad SHA-1: 6e80186cbe195d71918561d71a7b7940c1457054 SHA-256: 120a6319249828353ccb7f9ad9c8a0e4497c68fed1d1847555d81a31f64d3765
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure and multiple external links, indicating an attempt to trick the user into visiting malicious websites. The presence of numerous PDF links suggests a link farm designed to distribute malware or phishing content. The document's content and structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/trigon-roblox-hack-download-game-hack
    • https://wenshan.com.tw/upload/files/free-gold-cards-coin-master_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/robux-com-free_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/coin-master-free-spins-iphone_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/free-robux-only-username_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/spin-coin-master-free_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/coin-master-hack-tool-2021_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/what-do-roblox-points-do_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/coin-master-free-spins-and-coins-link-today_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/coin-master-free-spins-haktuts_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/free-coins-coin-master-iphone_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/juego-hackeado-de-coin-master_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/can-i-get-free-robux_GM431946152.pdf
    • https://wenshan.com.tw/upload/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/coin-master-gold-cards-hack_GM406889139.pdf
    • https://wenshan.com.tw/upload/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fa8.bin
f7bc3d3f5b5545ac0e43c5a0475854c14118d41306d72ef73855365fc73e4e40
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA8 27336 bytes
font_01_sfnt_off00008b13.bin
c0966b39e1a6286fc6d56cb9bbb61efb7f6186aa9d4e58970720b571ce9423ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 19096 bytes