Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cadea0804dfb5c…

MALICIOUS

PDF

33.2 KB Created: 2021-07-09 14:57:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1904c87bdf05ca8c0bd924f0906dac54 SHA-1: 78f4e02cca6633c207a11c167ef73175285630fa SHA-256: 11cadea0804dfb5cc110ee496ce9d957cfd46194265bdbcc973b14739dfdbb76
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links disguised as offers for free in-game currency and game hacks, a common lure for phishing or malware distribution. The heuristic firings indicate a link farm designed to direct users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-robux-sites-that-work-game-hack
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/robloxwin-com-earn-free-robux_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/oprewards-robux_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/minecraft-java-free_GM479516143.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/can-i-change-my-roblox-username-for-free_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-make-a-badge-on-roblox-for-free_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/change-your-roblox-name-free_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/hack-card-collection-coin-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/cmo-hackear-el-roblox-para-tener-robux-en-un-mvil_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-have-free-wings-in-roblox_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/cheat-engine-roblox-mad-city_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-coin-master-spins-daily_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-do-you-get-free-robux-nisterv_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002af2.bin
2d7ad44dad807c9dc4848b29701d5f2cd69509933d8124cac6f0f951c7803090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF2 22048 bytes
font_01_sfnt_off00005bcd.bin
c870e848b7333530fcf3a181653402c0177c63a978227bac510a2a158669bcb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 19472 bytes

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