Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaeb71f884f973e…

MALICIOUS

PDF

49.0 KB Created: 2021-06-13 22:46:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 226f7a4512270bc62e69784bb4b0edcc SHA-1: 49d48df88bafd7ef0ea5e18f963db00525785a83 SHA-256: acaeb71f884f973e55d2181a9aaba5dc5b2d33682077f683a06b39caee4368f4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are related to game cheats and free in-game currency, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/paginas-para-hackear-roblox-game-hack PDF link annotation
    • http://msfs-eastafrica.com/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/hack-week-roblox_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-items-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-roblox-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4956 24424 bytes
SHA-256: 13910c508eb9afd997e73eede5116b7517d8f0366987fe6919f46a21c31d900a
font_01_sfnt_off000080ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EE 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off00009bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDB 18744 bytes
SHA-256: 4c1359a5496cf7fe090740bee4cbf4c1948ff36a255344c8de6efeea9759da90

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