Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b16130a51245d6…

MALICIOUS

PDF

39.3 KB Created: 2020-10-05 12:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66290fb79899ba02be0e50696107accf SHA-1: c555af266bd60613ef8c8662cef5086799a05f76 SHA-256: 23b16130a51245d6efe5d308b2c5979bcf10b76b84cba01dc70621d327785069
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure and a large number of other PDF files hosted on disposable domains, suggesting a link farm for SEO poisoning or traffic redirection. The document body, though partially corrupted, contains text related to 'Usa visa application form in china', indicating a lure to entice users to click the malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=usa+visa+application+form+in+china In PDF document text
    • http://files.fmauhd.org/uploads/1/3/0/8/130813961/muxodapebuzekaz.pdfIn PDF document text
    • http://wezunoza.julia-ludwig.com/uploads/1/3/2/6/132681670/nezuki.pdfIn PDF document text
    • http://files.nextmanager.net/uploads/1/3/1/6/131606844/zotabakuni-pabin-vojez.pdfIn PDF document text
    • http://sosamuwe.whites-butchers.com/uploads/1/3/2/6/132681495/varomivuva.pdfIn PDF document text
    • http://zadus.parentlednetwork.org/uploads/1/3/0/7/130775172/7950535.pdfIn PDF document text
    • http://files.gtgtech.org/uploads/1/3/1/3/131380485/befba.pdfIn PDF document text
    • http://files.bridington.com/uploads/1/3/1/4/131453429/muvojiz_xobodudiboteva_vodikekupafimir_bakisuko.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/1/0480/4975/0175/files/vevokobibivuzozemobul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/mashya_and_mashyana_myth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2083/files/liziwigemoxenimotunidafiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3908/8022/files/xilufojidimowerurinegev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1031/6694/files/english_lop_rabbit_lifespan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/280bb688-c641-4aaa-8636-c3f4319dbeb8/bowenowadolixazozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e697e30-ed64-4d3a-a4ac-b8b62d9954e6/xidudodajinubut.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_off00005cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD7 5308 bytes
SHA-256: 047abe28ffe957adc9de7734c2be943d2ad25725e19caa8610bc14889787aa01
font_01_sfnt_off00006ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC4 9852 bytes
SHA-256: 7d68e68720b64e5f27af7e848dc26546f538a0733e29d46efdac92553b2ca22f

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