Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a4e3ea9c95584f…

MALICIOUS

PDF

35.7 KB Created: 2020-09-09 22:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5f135657bf5148b351b59ac4b35279 SHA-1: 8e7d058d912d6608b305f9a781c787acb2845d98 SHA-256: e1a4e3ea9c95584f04acea8e6a96cb9db4562b54f36984255062265f99df033f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to 'Ofsted report' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.club/wix?keyword=kiddies+world+oldbury+ofsted+report
    • https://static.usrfiles.com/ugd/17ce20_b525229c047c46758dfa2696d32c054c.pdf
    • https://static.usrfiles.com/ugd/a0905b_55cc770689954b8da4e2dac3c27291ad.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_702a416c8e5445939ce9e5264f35937c.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_7eea4a8b6fa047c9915eebd00fb03100.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92239d1f71f462a970f23ad998aaf7b.pdf
    • https://static.usrfiles.com/ugd/15cd4d_05d99776667b4f4e8c0834cbda4a8caf.pdf
    • https://static.usrfiles.com/ugd/b8c837_afa0cb97b4bf4762a3dc610c60ba0793.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcd83d7e36df4569834cf49203f6545c.pdf
    • https://static.usrfiles.com/ugd/2b3f46_924295b10b704c819cae9e16f8d53e1c.pdf
    • https://static.usrfiles.com/ugd/6cfc61_d7598b829633487b9889dbda5d41086e.pdf
    • https://static.usrfiles.com/ugd/29c71c_4adf345ab67548fd93af7b52b534046d.pdf
    • https://static.usrfiles.com/ugd/a18aa6_8c154ea59c1b4e488109de19318cc421.pdf
    • https://static.usrfiles.com/ugd/74c34a_888fef407e964613878b2ad45b0fac88.pdf
    • https://static.usrfiles.com/ugd/55e2c6_7bf163e9eb804f709e90a16007f8619d.pdf
    • https://static.usrfiles.com/ugd/2a1429_492448bcb16f4e26a7dcd398e0a8f4dc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dd6.bin
f511f63d015bf59441b1735d056856fac8f111c880828c44e4319a40efed4367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD6 5128 bytes
font_01_sfnt_off00005f6d.bin
e4a028cb109dd3a28d814ea8c40e8e2438d4536e4f9bf49d247d50315c410418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 10104 bytes

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