Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa85c6569f0035f5…

MALICIOUS

PDF

34.2 KB Created: 2021-06-18 19:47:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6322c585e47ebf5e199afb3cde00610c SHA-1: 6a3f3099dbbe05df30542adfbafb48099746c802 SHA-256: aa85c6569f0035f55ca0fa2dbda6a45bac2bcd7d055d13a50adc9d6529a6695f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a link farm strategy, presenting lures for free Robux and Coin Master spins to entice users to click on external links. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links suggests an attempt to distribute further malicious content or lead users to phishing sites. The document body contains a primary URL that likely serves as the initial download or redirection point.

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.co/app/431946152/pastebin-roblox-robux-free-2021-game-hack
    • https://library.uigm.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdf
    • https://library.uigm.ac.id/repository/free-robux-cards_GM431946152.pdf
    • https://library.uigm.ac.id/repository/roblox-army-free-robux_GM431946152.pdf
    • https://library.uigm.ac.id/repository/roblox-girl-clothes-for-free_GM431946152.pdf
    • https://library.uigm.ac.id/repository/roblox-admin-script-hack-pastebin_GM431946152.pdf
    • https://library.uigm.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://library.uigm.ac.id/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdf
    • https://library.uigm.ac.id/repository/free-robux-without-offers_GM431946152.pdf
    • https://library.uigm.ac.id/repository/como-hackear-assassin-en-roblox-2021-con-dll-injector_GM431946152.pdf
    • https://library.uigm.ac.id/repository/how-to-get-free-legit-robux_GM431946152.pdf
    • https://library.uigm.ac.id/repository/ash-shirt-only-the-free-ones-on-roblox-shopping_GM431946152.pdf
    • https://library.uigm.ac.id/repository/roblox-cheat-table-mm2_GM431946152.pdf
    • https://library.uigm.ac.id/repository/cheats-jailbreak-roblox_GM431946152.pdf
    • https://library.uigm.ac.id/repository/how-to-get-free-roebucks_GM431946152.pdf
    • https://library.uigm.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • https://library.uigm.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://library.uigm.ac.id/repository/free-robux-hack-no-human-verification-2021_GM431946152.pdf
    • https://library.uigm.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://library.uigm.ac.id/repository/how-to-give-someone-else-hacks-roblox_GM431946152.pdf
    • https://library.uigm.ac.id/repository/free-robux-hack-no-inspect_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e02.bin
16af5878b91e54531013e3fb84cd333426cf590e2a5b2f0f343f27588e3e3750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E02 22184 bytes
font_01_sfnt_off00005f22.bin
6f6652c3d15fca49c9503063d964474e9e7bd5331e931e4ea7871cc2b01d74d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 19568 bytes

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