Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba12b4b01572fd22…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 10:38:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a0681aa5d322dd30cb7938d946e7768c SHA-1: e9d855c143598ce8da027dae62f9ce42a4448e9b SHA-256: ba12b4b01572fd22d53c43a72be7f9ee5f50a4e21dbff0c097504520573b8c9a
82 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a document body that explicitly advertises 'Free Robux Generaters' and links to external sites. The presence of a 'Password-protected archive handoff' heuristic suggests the downloaded content is likely encrypted to evade initial security checks. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-robux-generaters-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-robux-hack-descargar_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-fast-and-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-202119_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-using-es-filer_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_off000050cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50CD 29360 bytes
SHA-256: 9900299fff3ae7d47430406462fb3d4d06145e8c15823957f82c541bd55eef7a
font_01_sfnt_off00009282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9282 18344 bytes
SHA-256: c65978df608d12e4662773111b595639a7113445a000c367557116035fe0caa4

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