Malicious PDF — malware analysis report

Static analysis result for SHA-256 b914726cd3b4449d…

MALICIOUS

PDF

35.6 KB Created: 2021-07-08 22:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bcd6a41f708625cbd0f01fbe424dfb11 SHA-1: a0df5bf5cae7858778ddb7fd2219174e95bdf7ac SHA-256: b914726cd3b4449de5cbcea04f3d46b1193df402c49d41a8daa3f9de5477468b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'Robux Gift Card Free' and 'game hack' to entice users to click on embedded links. The primary link, http://netcdn.tw/app/431946152/robux-gift-card-free-game-hack, is identified as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious websites for phishing or malware distribution, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/robux-gift-card-free-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-into-roblox-accounts-using-a-cookie-editor_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-tokyo-ghoul-online-cheat_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-if-you-got-hacked_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/cool-hacker-names-for-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-2021-inspect-element_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-adopt-me-cheats-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-hack-real-one_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/boku-no-roblox-free-spin-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/ispoofer-pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-black-pants-red-shoes-free_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/escape-are-51-roblox-how-to-free-the-dead-alien_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tiktok-free-hearts-hack_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326E 22952 bytes
SHA-256: 76655e40cda09e92529297a42062c833da6e4b186fce3b307b92f46322ccea4c
font_01_sfnt_off000065f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 19112 bytes
SHA-256: 2ea37c508b0c91132d1ae13c4ee486db57383bf0a0a064ac7651587d02fc5b1e

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