Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a50e3db5c0105…

MALICIOUS

PDF

43.5 KB Created: 2020-10-03 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a42eba5a1a9882fc1f7ac2fbcf8196d SHA-1: d7659875f378751cf67e8e848042495963389040 SHA-256: b86a50e3db5c010552d02b3c2068f8c82bc2682d50a4360f77f5402f373ba4d3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with a surgical procedure keyword. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=bichectomia+procedimiento+quirurgico+pdf In PDF document text
    • http://files.arkjprogram.com/uploads/1/3/1/1/131164202/wefizanu.pdfIn PDF document text
    • http://files.terrapointepointers.com/uploads/1/3/1/3/131380623/lurexoxigij_tanopo_ribako_bedopovufez.pdfIn PDF document text
    • http://files.hullabaloomusicfestival.com/uploads/1/3/2/7/132740415/zikomigop.pdfIn PDF document text
    • http://beniseg.transformationalparenting.co/uploads/1/3/1/8/131856077/bimevelo_xesoxibumubo_tuwife_dorowazafamovaz.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/37578547715.pdfIn PDF document text
    • https://site-1042627.mozfiles.com/files/1042627/33135940351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6535ee19-2bbe-4a79-8bdd-fd6c3be5e9dd/45873554083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd939593-1744-4961-8ef8-7dfc05772097/fonugiwigezamedetexofofeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19133e68-3fac-469e-85e5-c89747768d3e/37919214738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3199ac10-96e5-45ec-92a0-ebb276298911/28191692673.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_off00005dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFE 5416 bytes
SHA-256: 9fd6b732d8946b725164d5caa257405f8054210c4d76df9f5c40681de37b0f28
font_01_sfnt_off00007030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 10324 bytes
SHA-256: 1a007f7cba62ac493dde6549e2b4d90e822335dc6ee107c03aeb3c20b991eea5
font_02_sfnt_off00009326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9326 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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