Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f88f4776f62aa7…

MALICIOUS

PDF

47.5 KB Created: 2020-09-30 08:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0598991a08c0196b5c7bb02f4496b554 SHA-1: 665011e7a4f3ee2ea19a0b623102f1e5ae05a37b SHA-256: 03f88f4776f62aa7a74d90354a1bc01df33184d3ecb0a090e267e584e5ce9b0b
124 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to trick users into visiting a potentially harmful site. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting further supports a 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 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://ggtraff.ru/strik?keyword=algorithm+design+by+steven+skiena+pdf In PDF document text
    • http://dozoxifi.pineridgereconciliationcenter.org/uploads/1/3/2/6/132682735/wanuku-tumewateja.pdfIn PDF document text
    • https://site-1037096.mozfiles.com/files/1037096/5103764620.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/novak.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/jibufakufelatok.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/35859953003.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/fesopemekedawadow.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/defimapep.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/fivokape.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://cdn.shopify.com/s/files/1/0440/3465/4358/files/big_data_processing_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/barekunosuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8452/4949/files/ipad_model_mc705ll_a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/an_introduction_to_zen_buddhism_suzuki.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_off00006d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 5600 bytes
SHA-256: 1c44541a84b0ae71c6354d0f9a4b62ed07396e695aa69903c4d2166c16cbe97d
font_01_sfnt_off00007fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE9 10308 bytes
SHA-256: c38489d5533a163a742bd9a539f65939ed6e8dd09f9a1e21a0be4c320ee95345
font_02_sfnt_off0000a331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA331 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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