Malicious PDF — malware analysis report

Static analysis result for SHA-256 9591ba8a354ff0c8…

MALICIOUS

PDF

47.7 KB Created: 2021-05-30 18:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 95258c7c93ed64c2540e5dec04470fed SHA-1: 090736d4ae8692867e268078c749a0ec5235214a SHA-256: 9591ba8a354ff0c8758174bfdde33a062e9a4bc7e313f9dee93c28864636e191
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a prominent external URI pointing to a site offering 'free Robux', a common lure for malicious downloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where the downloaded content is encrypted. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9418

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.xyz/app/431946152/free-robux-no-verification-game-hack PDF link annotation
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58A8 27328 bytes
SHA-256: fc39552f29614c2798442b264b99c0e9d8c0026f0338d73c8564f4939862a124
font_01_sfnt_off000096ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96AD 18600 bytes
SHA-256: 361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051

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