Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c22094cc2cfb2e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-29 15:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a01b740cf4e494fe002aef479b644fd2 SHA-1: 2ae07ffcd7214581a1d9d3e9d6b92b72712704f4 SHA-256: 27c22094cc2cfb2ed29a1f9d289c3b91067a730b35c076b3fc04d6075eac92a7
150 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free worksheet, which redirects to a malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this redirection to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document. The embedded link farm suggests an attempt to distribute malicious content widely.

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.me/wix?keyword=human+body+worksheets+free
    • https://static.usrfiles.com/ugd/b8c837_de70664321e94bd5ae1b2183916fa764.pdf
    • https://static.usrfiles.com/ugd/b8c837_88a1fd10b1924492acca1431404190da.pdf
    • https://static.usrfiles.com/ugd/b8c837_569a24d479374c838a02addce42e7f0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6821137c406144e4a16a979c4c63d974.pdf
    • https://static.usrfiles.com/ugd/b8c837_4263e917e5ab430bbce7e8548f6d2abe.pdf
    • https://static.usrfiles.com/ugd/49be48_bb7c5fc1e65f4ef496e2f30101dc9e9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_94b99332215e4d248ef9b77a17f3bd95.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/jquery_download_files.pdf
    • https://cdn.shopify.com/s/files/1/0445/5025/8852/files/cosmic_love_jan_spiller.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/indiscretion_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/44578702231.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_off00005c58.bin
d63a55e45e6f46c775d88224d9fb7ecffa4dad04cc68f459c645ac0001a93abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C58 5472 bytes
font_01_sfnt_off00006ed0.bin
3caf27ceece5fab168434328064091576e347a06a0fc6c5c86a7c82dea36588f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 10120 bytes

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