Malicious PDF — malware analysis report

Static analysis result for SHA-256 02137cd04f72f75d…

MALICIOUS

PDF

35.7 KB Created: 2020-10-31 06:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7151064153a7f649caf6bf35ca61401d SHA-1: 15a5e1111fab2634ec612dca3eea2b86ea3519fc SHA-256: 02137cd04f72f75d00d2629437b1e817699a69903a0fbc81c4551603704b8b61
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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/aws?keyword=cellular+respiration+the+big+picture+webquest+answers In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/sozafanimitu_lepebe.pdfIn PDF document text
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/lenus_jedor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f9007131d83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f8bd00e64093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_5f9b268f4d437.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/vasojizetego-jofarepopomud-tewiniroje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_5f9cd5a3baa3f.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/jadixirutoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/307411ea-4855-4c16-90e8-8d9a9c0a5ae0/26050303040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4964/7271/files/halo_cryptum.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_off00004d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D75 5460 bytes
SHA-256: a287d9b34c3b9f084929750c8ab1bd43ccf0746a2c1b4f89a666bcbc8ac29148
font_01_sfnt_off0000600c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600C 9896 bytes
SHA-256: 03312a7642cf98d160f4ac5b0d2bf976bf796c20e3c9dd9c4465915a56a859c4

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