Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e234d3fa200be2…

MALICIOUS

PDF

39.5 KB Created: 2020-10-09 05:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dcaa1dc2af34fd259c65c8732f8906bf SHA-1: 1a481b5856266a81bef78bfc4a787743a91d2f07 SHA-256: e5e234d3fa200be2801ca5e192a109d6ac61493a92c109a980db24532a465e8c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a coordinated effort to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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=ellen+lupton+how+posters+work+pdf In PDF document text
    • http://files.thisquietdustceramics.com/uploads/1/3/1/3/131380397/37c103fde82f.pdfIn PDF document text
    • http://files.trevorjonesgolf.com/uploads/1/3/0/8/130813453/numopuj-gepazovugupav-muxoragavisuwuz-netixaji.pdfIn PDF document text
    • http://files.brianbustosart.com/uploads/1/3/1/3/131383284/najaruveg.pdfIn PDF document text
    • http://files.gruffcorn13.com/uploads/1/3/0/9/130969728/9042446.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/75801919512.pdfIn PDF document text
    • https://site-1040987.mozfiles.com/files/1040987/62596708196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9346/3718/files/66266363546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4779/8952/files/senior_picture_for_yearbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8289/9616/files/professional_responsibility_attack_outline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9081/2322/files/american_jubilee.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E10 5032 bytes
SHA-256: 1f1b47ed13f8b12fda01a81d315e163a444096c15fb34b3a683f546baeaf1aca
font_01_sfnt_off00006f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 10040 bytes
SHA-256: 622fce0c9a879a7860e71be7954b3c65bd7badfed8d65733f8d2b1266bc13311

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