Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef4c1347e8c4639…

MALICIOUS

PDF

41.9 KB Created: 2020-10-16 05:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d080cbb4d17ad433763cbeb75fc406d6 SHA-1: 7f9991732bf73e6d9deab45d9f31fade02535a22 SHA-256: 6ef4c1347e8c46399c40d030150833545222f5b7f2398f00580e026f0bbe1c37
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. One URL, https://gettraff.ru/123?keyword=rappelz+the+rift+apk, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=rappelz+the+rift+apk In PDF document text
    • https://site-1043447.mozfiles.com/files/1043447/pathfinder_goblins_of_golarion.pdfIn PDF document text
    • https://site-1043669.mozfiles.com/files/1043669/66415445658.pdfIn PDF document text
    • https://site-1038971.mozfiles.com/files/1038971/23028954903.pdfIn PDF document text
    • https://site-1040288.mozfiles.com/files/1040288/fire_sprinkler_system_design_calculation.pdfIn PDF document text
    • https://site-1040317.mozfiles.com/files/1040317/nikuburobu.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/xisub.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/jazulifevalosu.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/939e82361.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/rerip_pegijakex_tajojij_farivorepaki.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/podewafi_lamatuvowud_botemuzoxojabof_firamixivosib.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/8f24b.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/6378219.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8712bf43821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f870efcbffff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f87adb620ee2.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/3875892d-b9aa-4131-9ea2-9e0b37e46712/14274801710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78df503-d347-4569-a35d-7c96ba3af639/buresolenokosupajiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7f68fc-84d5-4d09-85b2-bc22205c1806/92437281250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac21c37-e1d2-4633-b239-d3188798f246/54950129093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbd865c-b565-449c-bf83-99ed04cbbadc/46699214121.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_off00006458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 4932 bytes
SHA-256: 79642dd10303ebf5281dd7967ee5b17890b342357b9c92ef76c60a9f1953b45c
font_01_sfnt_off0000752d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752D 11308 bytes
SHA-256: 3b2944a885ffdc65262b34eec0ae1b160901044e8e24ebe7c621f263029ab4ea