Malicious PDF — malware analysis report

Static analysis result for SHA-256 73932277db9bb2c0…

MALICIOUS

PDF

42.3 KB Created: 2020-10-03 08:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 244e594670d0f982b592b744e096dd96 SHA-1: 64be711536e143d311a5e3db4a2d4b3003e327e0 SHA-256: 73932277db9bb2c0e005960654603d62988d9b7f1641ccca61899fd21305993b
184 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious infrastructure, masquerading as a sewing machine manual. The primary redirector URL is https://cctraff.ru/strik?keyword=singer+sewing+machine+model+237+manual, which is part of a larger network of links hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the PDF structure is consistent with SEO spam used for malware distribution.

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=singer+sewing+machine+model+237+manual In PDF document text
    • https://site-1038631.mozfiles.com/files/1038631/fabarolazanibogoruzo.pdfIn PDF document text
    • https://site-1040602.mozfiles.com/files/1040602/86516444926.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/gimulaparepikanatibetu.pdfIn PDF document text
    • http://files.dsauae.ae/uploads/1/3/0/7/130738637/9222488.pdfIn PDF document text
    • http://ritusigid.runninonfaithtc.org/uploads/1/3/0/7/130775358/7634734.pdfIn PDF document text
    • http://files.gaiabamman.com/uploads/1/3/0/9/130969440/ec0a692453b7b4.pdfIn PDF document text
    • http://konasuf.peonygiftsandkitchen.co.uk/uploads/1/3/2/6/132682235/341a2ecaae.pdfIn PDF document text
    • http://files.kristaroesler.com/uploads/1/3/1/4/131437295/493681.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/54b42d4d-a4aa-45c9-a66e-59177ece6a8d/4323397699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b734fd-3219-48e2-b436-401ae8f34e6c/tolukewimonixinitinuvumam.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_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 5924 bytes
SHA-256: 423be06b90b3b6c44d78aec2b02db01926a58394f92e094bdc12bef68bb298c4
font_01_sfnt_off00007956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7956 10452 bytes
SHA-256: 1d665878d8f56956729b90061148cbfa82e9f3b7896a3e82fe5fb6cefd5d33f8

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