Malicious PDF — malware analysis report

Static analysis result for SHA-256 c434827ab31d99ec…

MALICIOUS

PDF

39.5 KB Created: 2020-09-17 12:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91f1210b2af033a9f22b169a7330ec0 SHA-1: 5b7ac172a18d62f1f9249f6b39c7feff83a0926c SHA-256: c434827ab31d99ec2bd5840c39edc5dbef14de2393a439a0bbf5a9fcbcc07c20
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to creating a study guide template and includes the malicious URL. This suggests a phishing or social engineering attempt to redirect the user to malicious infrastructure.

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.link/wix?keyword=create+a+study+guide+template
    • http://files.acminsurancejacksonville.com/uploads/1/3/2/7/132740623/5403702.pdf
    • http://supaxup.cathrynweissportfolio.com/uploads/1/3/2/7/132740718/jaledalobowoxu-gazul-biwidafaw-zadujisakifux.pdf
    • http://files.thehappyhealthychicken.com/uploads/1/3/0/8/130873941/6144827.pdf
    • http://roxib.campustour.ca/uploads/1/3/1/3/131380344/3225703.pdf
    • http://wusos.ashlynnsboutique.com/uploads/1/3/1/4/131437594/tuganixesifatur.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/document_classes_latex.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/93517559132.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/94388595828.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/toxof.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/rekix.pdf
    • https://b95b570a-1f93-4cb8-989a-878062603a3b.filesusr.com/ugd/2486b5_6bd5085d2a3d4d9cb6989e7feb8efa14.pdf?index=true
    • https://546ed2a1-e0e8-4c92-aca8-6689911f9f88.filesusr.com/ugd/440e29_47bcfaefc64c4206b59962c66f711caa.pdf?index=true
    • https://5b424016-6145-42a9-a0cc-93021da50399.filesusr.com/ugd/2d1648_66a73c09726d49c996552a33c972f75e.pdf?index=true
    • https://12487f01-fd08-4cb8-a56f-c35bdeb1aeab.filesusr.com/ugd/2d1648_ec8ef00e68a043f88527737fa61123cf.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_off00005db1.bin
3df40c21bfc9a5e950c3b1972ba0be7c4531dd12b46f01781104038f3374a466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB1 5288 bytes
font_01_sfnt_off00006f9d.bin
01e9ecac35e185c15b500cc2c39201712a24b91ff7d0a28e7ccab4a9a310f2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9D 9888 bytes

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