Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bcc734aa2edfe1…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 15:04:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a28b40816bedc8472667fd4c5bb67c03 SHA-1: a7281ca6015f1d336248c3676178a6846ab66f3b SHA-256: d9bcc734aa2edfe1471d0b2f9a30108df58d6ff7a7e16cd87b9ee699fea074e8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and a document body that promotes a lure for free Robux. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm designed to attract users searching for game cheats or exploits. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file. The primary goal appears to be directing users to external sites that likely host malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-on-mobile-game-hack
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-free-roblox-games_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-20210-robux-on-roblox-2021-for-free_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/get-free-robux-com_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/haw-to-get-free-robux-obbys-2021_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-links-for-today_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/robux-no-survey_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-cheat-in-roblox-mega-fun-obby_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/all-game-roblox-admin-gui-hack-working_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-cheat-engine-download-no-survey_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/is-there-a-hack-for-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/hack-roblox-2021-espaol_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/bullet-hell-roblox-hack_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-sell-t-shirt-for-free-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/animation-free-of-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003155.bin
5fa411ad1a83ed5ba2876ca317cc10a39c5b317d96e41935ba71286682a496b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3155 22248 bytes
font_01_sfnt_off000062a4.bin
5331e3b47e1eecd1b1cb57ee2f3545b8b8fbb1b10f6e158321778d87dfa25569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 19372 bytes

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