Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45e7e583e0ac361…

MALICIOUS

PDF

40.1 KB Created: 2020-09-19 05:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28eb7de4addad8eec784fb911147499f SHA-1: 902693727d9ad001c0824991e95f1d294a0b1900 SHA-256: c45e7e583e0ac361ed8c01c5d21778603e548bca58b75c52456e15b41429f942
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to download potentially harmful software. The document body, though heavily obfuscated, contains the URL and keywords related to downloading software. The presence of a link farm further indicates a malicious intent to distribute content via numerous PDF documents.

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.link/wix?keyword=net+cut+apk+download+uptodown
    • https://d6b36f7e-3b98-4006-9c55-1a267aca0ac9.filesusr.com/ugd/0c4177_46d01ae76db84f88875f95b4d340f60e.pdf?index=true
    • https://64cedf5c-1026-49ef-9df2-49cbf570f55d.filesusr.com/ugd/d2759c_40b4a8dc3157432db408fbab16015b5e.pdf?index=true
    • https://f8667bbe-7968-4ea2-83ae-d2bb5329f5ac.filesusr.com/ugd/834936_20b1eed964d84013863db4185a71118a.pdf?index=true
    • https://1bcb5a12-4d3b-48f8-ade7-2a135dfd6915.filesusr.com/ugd/9117e0_3ae5e5afed874958938c160da1780523.pdf?index=true
    • https://c4a272aa-9152-41f1-bb00-df921522d6e0.filesusr.com/ugd/f7fbc8_a4c84f16fedd4e73988897782d83d559.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/zoratonor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0301/0468/files/54367587903.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/67494717567.pdf
    • https://cdn.shopify.com/s/files/1/0440/0729/3086/files/30871340266.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/32307864048.pdf
    • https://51500f8b-fdd3-4b0d-b921-f3417294e90d.filesusr.com/ugd/03ae60_aeaa6e5c567e4bd59ed177585cccf1fe.pdf?index=true
    • https://767aca6c-4df1-4948-ae52-51c42284c0e3.filesusr.com/ugd/764aaa_220df2a8b4cf48e4aff097bf65f47299.pdf?index=true
    • https://1d0adb32-f5e8-46f8-8cf7-978e66ea46e5.filesusr.com/ugd/34e21e_823edcd54ea844a78bb2efa9506e81f7.pdf?index=true
    • https://57e4f792-487e-4220-a7e0-1ed2f51641d3.filesusr.com/ugd/46a5ae_bb805a4c9c8f41a1b2118643b4b36dce.pdf?index=true
    • https://a1d35d71-f315-4c33-9f6e-a73b6e61390e.filesusr.com/ugd/82d61e_5bf9ce5b6a1b4d86ae8ddc7aba42c027.pdf?index=true
    • 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_off00005962.bin
81da00bacdd33318e2b2ceabf564902a784f08806b7e3d6a20f2fbccfb4ccb6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5962 4916 bytes
font_01_sfnt_off00006a4c.bin
9b0107b305c84a609937a221d4f61dabd7545d869f1aab395bff200b09b9901b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 13008 bytes

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