Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b3065b8521ac8e…

MALICIOUS

PDF

35.2 KB Created: 2021-06-18 02:57:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0059fde99c5764745c1b8bbb52a8f441 SHA-1: 06c65a1612948dd3ef7e69f054845c24f46e7a0c SHA-256: a4b3065b8521ac8e25350cf270c9f07af2f702de563376c0acec868d502432a9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game cheats and free currency. The document body explicitly instructs the user to copy and paste content into a shell, indicating a lure for command execution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/how-to-get-free-robux-at-computer-game-hack
    • http://opac.akafarma-aceh.ac.id/repository/como-descargar-hacks-btools-para-jailbreak-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-real-free-spins_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-with-no-verification_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/freespinandcoin_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-world-free-download_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/cool-hacker-names-for-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/www-blox-us-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-minecraft-java-edition-account_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-script_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-daily-spins-and-coins_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/blox-supply-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-android_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302b.bin
9c84fc6c2cf9bd5b31c146880f9962ee12332d28f124cf96d4ed005e1a2829f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x302B 22860 bytes
font_01_sfnt_off00006380.bin
9055ffcab99174f55bc90faafe5df47cf1b1ecb05980fad24642f623bed33637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 19420 bytes

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