Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be489e3d911850a…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 04:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 271ec940fa5aeeef5761a6f6584b22b8 SHA-1: 658ddba8c366c2f4a49762db568ff1caa1751f26 SHA-256: 7be489e3d911850a853c570dacfb5d001ac8e076335609dc84ec78257d070dff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites.

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.ru/wix?keyword=im+wundersch%2525C3%2525B6nen+monat+mai+translation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7785/1543/files/subukukevesibawevatefusu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6204/8421/files/85431250324.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/managerial_accounting_tools_for_business_decision_making_6th_edition.pdf
    • https://static.usrfiles.com/ugd/136d07_b98a5de41d1449929f1216e3b3511133.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b22e770c55d452cae69fb64fe715b82.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_a04206c87e964f0db31e766c991d7e2c.pdf
    • https://static.usrfiles.com/ugd/4725f1_a3036ef9f9b3448c8730228a7559513e.pdf
    • https://static.usrfiles.com/ugd/b6edda_2015db672acf47589a13a73ffc081bea.pdf
    • https://static.usrfiles.com/ugd/b47706_685932e483ab467fb4bf4e072bd1c588.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b02eeaa05704768a4dc0be4137c9f2e.pdf
    • https://static.usrfiles.com/ugd/6da380_abadf2fada2b44e5a454dacfffc36827.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/arguing_about_literature_2nd_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/bobby_womack_greatest_hits.pdf
    • https://cdn.shopify.com/s/files/1/0462/7084/0981/files/63687329496.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/522085129.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4946/files/95601329033.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_off000076de.bin
8f68f2f6e5c4f34e7de57c956ca34e95b6f8388bfd7aaae12bcee22e96d59ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DE 5348 bytes
font_01_sfnt_off0000889e.bin
ea885428da0b5f91cccfba5b92f7d8aa52361e3ccb5b9ae6656de724970510e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x889E 11220 bytes