Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c53989680648b4…

MALICIOUS

PDF

45.6 KB Created: 2020-11-06 05:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 724d01f2b4a9638e180b9e3d42582a5e SHA-1: 164a3c647483c37d6142ce59f926b73fac35eeae SHA-256: a9c53989680648b4e43bef2e76d393985d0f18bf5377c45a42ad7da86c475b11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many Weebly-hosted PDF links suggests a link farm for SEO manipulation, likely to increase the visibility of the malicious redirector.

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://cctraff.ru/strik?keyword=first+aid+step+2+cs+6th+edition+pdf In PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/8049581.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/semodamivodi-fagoriparimiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5f9d591aac55b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8c89e5af015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f909d76a853c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f9718d824fe7.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/jogikozidonedozefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f9a1a649eccc.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/seduf-pinomulapovuju-fuxodilugabeti-xupufisemogul.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7326fdda0f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/epf_non_employment_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/transmission_approach_in_popular_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/direct_and_derived_demand_examples.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6772 5452 bytes
SHA-256: 88cad886e87a793f5abb52bbfb93832440fbe72a809ea577b2845cd9d14105f9
font_01_sfnt_off000079f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F6 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8284 11360 bytes
SHA-256: 3cd88e3aff825fd6e42d53b7536266c61af31386c008a6a41fc06d0cb1bf54f6

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