Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fef990eac5efabf…

MALICIOUS

PDF

35.8 KB Created: 2021-06-18 11:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c14a37afb730facbad929b87a0eac959 SHA-1: 773799e27c5ed32105bc7b927ca568d8017598a8 SHA-256: 8fef990eac5efabfd741d8610860dce9343fa20976091d822a7007fc1e1c02d5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a DOC BODY that explicitly mentions '20k Robux Accounts Free' and 'game hack', indicating a lure for potentially malicious downloads. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links, with one pointing to a suspicious domain. While no scripts were extracted, the presence of external URIs and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent.

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/431946152/20k-robux-accounts-free-game-hack
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-get-free-faces-on-roblox-2021_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-hack-a-roblox-account-with-forgot-password_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-robux-without-verification_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/best-free-minecraft-server-hosting_GM479516143.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/synapse-free-download-roblox-hack_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-robux-hack-human-verification_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/robux-hack-apk-android_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/minecraft-online-free-no-download_GM479516143.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/robux-hack-script-for-free-robux_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/roblox-slaying-simulator-hack-v3rmillion_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/get-20212021202120212021202100-free-robux_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/descargar-hacks-para-roblox-2021_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/get-any-roblox-items-for-free-with-inspect-element_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-robux-giveaway-code_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/roblox-admin-house-hack_GM431946152.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/get-free-robux-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000036b6.bin
cef9bb8f6208ba0447580b00aa84ef88c51e3498395f17d38f2df000e31eddda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36B6 21816 bytes
font_01_sfnt_off000066ce.bin
40f60a090fa3a5bcfc51d6d4ddee6e421dd4da7adb1f9c024cb48b246d9bc68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CE 19100 bytes

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