Malicious PDF — malware analysis report

Static analysis result for SHA-256 4558e0e3001fc938…

MALICIOUS

PDF

45.5 KB Created: 2020-10-26 18:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 63b5ec73383a2dcb65ad82fba8691c77 SHA-1: 38cc20dcf33c2a9376a1b52fd054142fb236e7fe SHA-256: 4558e0e3001fc938948a3a34d89efdece29ce289a32bcea8efd9fb8d9cc3d8fc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO abuse tactic. One of the primary links, https://cctraff.ru/strik?keyword=northampton+county+property+records+nc, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to property records and the URLs, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=northampton+county+property+records+nc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8c4fbe4a47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8805f0008d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f87ab3e2c8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f8b77299f510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8f491ad7f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5f87a55d6919e.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/3775e4fa1.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/wunotarulekojukibat.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/9243879.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/zotogovojod.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://s3.amazonaws.com/jepinebawo/pevokif.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/zegevowomugidipim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/65882083490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/73174253965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5262/4803/files/61380380052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0044/6113/files/entrepreneurial_marketing_mix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8841/7446/files/garidosaxe.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_off000062e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E8 5184 bytes
SHA-256: 44cb1f0e8d284044b3ebfabfad06631b11656989736b38d3db374ccf4be5e5a3
font_01_sfnt_off00007462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 10788 bytes
SHA-256: 9dcc09de793a9bd43a8135bb5fa6ae3d352b224c0e15c1ae6af113575d12e379
font_02_sfnt_off0000990e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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