Malicious PDF — malware analysis report

Static analysis result for SHA-256 119e6811d859bfa2…

MALICIOUS

PDF

43.4 KB Created: 2020-10-01 10:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 62cb5f60bfde73aa9df2386ad1518651 SHA-1: e4af6c7d8e32e9a20f264235e8919f6744d531b6 SHA-256: 119e6811d859bfa2688d0edd23c2593b59ddafd9e4b0469e5e3d469c91b22cf1
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, characteristic of a link farm. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The document body itself is heavily obfuscated and appears to contain the malicious URL, suggesting it's part of a lure.

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=arap%25C3%25A7a+t%25C3%25BCrk%25C3%25A7e+ingilizce+s%25C3%25B6zl%25C3%25BCk+pdf In PDF document text
    • http://files.rare-prints.com/uploads/1/3/0/9/130969755/be967.pdfIn PDF document text
    • http://files.dare2dreambigger.com/uploads/1/3/1/8/131856446/753689.pdfIn PDF document text
    • http://files.makingpeoplewhole.org/uploads/1/3/1/3/131379268/dosovazekafe.pdfIn PDF document text
    • http://files.ppmatters.com/uploads/1/3/0/7/130739577/25061.pdfIn PDF document text
    • http://files.lighthousechurchandchapel.com/uploads/1/3/0/8/130813400/6843427.pdfIn PDF document text
    • http://sajaful.elfangelscreationslloyd.ca/uploads/1/3/1/3/131380344/68d4ab.pdfIn PDF document text
    • http://lesorito.gsmbchurch.com/uploads/1/3/0/8/130873995/wojujoru_dalutaxinarirex.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/938f8e4a-9a8b-44e1-9075-c994132ceff3/56096782519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab75ffea-7c3e-49dc-9605-2bb3b79ef05c/84193702710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9416b75d-301a-4289-8225-f1dd77336f5e/jotezovapuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cc5d92-2d1a-4eef-912e-11d5df624810/todonanidikodisowomemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d69740-346d-4248-bdf6-4b55f47de88e/9769263160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/human_anatomy_and_physiology_of_respiratory_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/6913667964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/startup_budget_template.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_off00006827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6827 5868 bytes
SHA-256: 524dea243a6e3ee1c3198cefdfcd672c61a9d78e2f35c7a07321a3a8397abae4
font_01_sfnt_off00007b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B83 11004 bytes
SHA-256: 0106c7c7a4186df99a236079866eb04ff5b49badfcb0db7a41384b04c571812c

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