Malicious PDF — malware analysis report

Static analysis result for SHA-256 66967bcba9638efc…

MALICIOUS

PDF

42.1 KB Created: 2020-08-29 14:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58117e410f9e126b7a9d0e10a4eceffc SHA-1: 14ffa88f8af62f324da246808da5170aaef2d3e2 SHA-256: 66967bcba9638efc8719d1d9cd67aea3efd3c58f2fe21dfe077f558561c7ade0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=actividades+de+primer+grado+lectoesc'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external documents. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=actividades+de+primer+grado+lectoesc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_f2933df0f45a4e1c93f0ae2af8fecf26.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_a98ad2f131ef4ebbafd670f183b9561c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f3e1cbf8447b7ab0616285f8b1dff.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/71579746570.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/34400408263.pdf
    • https://cdn.shopify.com/s/files/1/0432/8810/1030/files/what_is_cavitation_in_pumps.pdf
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/chess_puzzles_mate_in_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/85070447869.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/86169888897.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/internal_and_external_whistleblowing.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/tafamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/joduxuzolavar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/poe_flask_crafting.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76e980b1f39450f951d76a58e35e1f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_12196ea79af14e468be3da3af526be7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e56b2ce15c044e99ac8fe15d1b72301.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621e.bin
5bdecced88d2b01828eecddfc5d07e437e11f8494e8743dcd07ca1fd76f64720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 5444 bytes
font_01_sfnt_off0000748a.bin
cb5a2595eed2e9d37c19b029f9977efa23ac5c0a843f30efe0059d2c720b7f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748A 11384 bytes

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