Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e860950545e9fd…

MALICIOUS

PDF

43.1 KB Created: 2021-05-17 08:18:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d73c337584a3de6ebb486eca143ef5d8 SHA-1: 8b6a9b9c3ff6805244b19d8b240633fe463fd337 SHA-256: 45e860950545e9fd1d2974b0cbffc495fe1df3d522f32d816003c5ecf993d73a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, pointing to websites offering game-related cheats and items. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a download or redirection attempt. Although no scripts were directly extracted, the PDF structure and embedded links indicate a malicious workflow designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-admin-roblox-game-hack PDF link annotation
    • http://bufbd.org/images/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/cone-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/simplysarc_GM479516143.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-2021-robux-for-free_GM431946152.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
stream_003_off000048a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A6 26796 bytes
SHA-256: 1a01aff7a53c4d9a813b15c65cf0719ab8ada0ca864c9aa4fda2bdcfb1770aec
font_01_sfnt_off000085aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AA 18504 bytes
SHA-256: 830d3dec1a52b5677d0ce8f7274f803060246143ae3edd9314b7ddd4a581007c

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