Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1fca3257329f6a…

MALICIOUS

PDF

43.8 KB Created: 2020-10-25 08:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cebfd57d7a58f8b400fc95d84f88f50d SHA-1: ee6f52e85eb21384b5105488756f4fdfb75c1114 SHA-256: fa1fca3257329f6aec0ff9ff15d1adf7231dc6f031576c8a33cae96863a3d909
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the one flagged by the heuristic. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or a method to obscure malicious destinations. 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/123?keyword=hotpoint+tumble+dryer+repair+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f90b8035765a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f9145704dbc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_5f9091c72c57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8f24b8b4ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5f8e19aa28e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5f8dddf7c26e7.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/nalujemefoxej-matezilero-vofujulajakixop.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/fipobux.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/1/0481/7050/0247/files/vobobar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3905/0906/files/96851449160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1688/6678/files/47185416009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/bissell_steam_mop_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6703/8613/files/siwibutitatudegexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/catalog_of_design_patterns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/android_studio_relativelayout_overlap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9038/1473/files/30111937720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/kiworifotozanem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7485/0468/files/mubikajajexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/nikon_prostaff_scope_adjustment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6075/4101/files/kinamumavewofagewamanebul.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_off00006c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 5132 bytes
SHA-256: 65ddac40a621d1641b19cdf671fc56a03ca7fbb03b7ae83e998f0c15ca92c31f
font_01_sfnt_off00007dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBB 10500 bytes
SHA-256: ca5cf065ebb084caff8167a34c854af3536cca8eecf58d5dee7aed16f53cec02

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