Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c42e32b04132d3a…

MALICIOUS

PDF

49.2 KB Created: 2020-10-15 18:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 4e68a6e166aef3c09d8a4ccdad23f447 SHA-1: 91dc4f4f09ab583ddd0be94a6f9efcf4bba103ae SHA-256: 8c42e32b04132d3a0cd04b040d0aeed986139ca57bb84f1af52b40d622c7b384
184 Risk Score

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://gettraff.ru/123?keyword=counting+hundreds+tens+and+ones+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f87baf265bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f874d32d1857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f874dc5b70ef.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/8102170.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/razituziwekave_luwebar_sumoj.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9653445.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/8166145.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/7878292.pdfIn PDF document text
    • https://site-1038660.mozfiles.com/files/1038660/barim.pdfIn PDF document text
    • https://site-1042271.mozfiles.com/files/1042271/63076478838.pdfIn PDF document text
    • https://site-1038604.mozfiles.com/files/1038604/reroxumiliwogajififas.pdfIn PDF document text
    • https://site-1041676.mozfiles.com/files/1041676/remoteness_of_damages.pdfIn PDF document text
    • https://site-1048530.mozfiles.com/files/1048530/pre_algebra_textbook_7th_grade.pdfIn PDF document text
    • https://site-1041934.mozfiles.com/files/1041934/tetav.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://uploads.strikinglycdn.com/files/97e9bcaf-3873-4a6d-8d3a-25d30e3a3ad7/39199487399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464bfa8e-34c7-465f-8d6b-5df555a897fd/81991778435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9166774-5913-47ef-8b5d-bfc067f3c035/saxalabon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b84f37-b828-4a39-acd2-5ff77edad2a3/sirufowezawet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffddd96-ec57-4e52-a418-b5c02a79c25e/47096356627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2682384-f1fc-4c85-a225-6671c057f1f5/bemukudosodadunix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45566378-aae4-4502-b567-b148ff4bfab2/vopejika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681d1954-aaeb-4787-a1b2-cb319bdcf3e7/xirivedikab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a470ff0-2ba2-4ca6-b130-f2b83dbed1ed/wowuto.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_off000074e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 5116 bytes
SHA-256: 05341e3aab910e2e69fc2310cb7e04c8c7035c7eb7ccdc50d9490f912f0811d3
font_01_sfnt_off00008651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8651 10008 bytes
SHA-256: 46322200ccd65c9906f5ae23fc9ee0a9c04427f65a9c90f5969612dd6a3817da
font_02_sfnt_off0000a88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA88F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e