Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ea1983165fbd2f…

MALICIOUS

PDF

46.3 KB Created: 2020-10-07 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 781e2475288688f4b7aa140fbf644109 SHA-1: e3abb6780bd9d78e6c5f7e97184a2a8adee4db73 SHA-256: 42ea1983165fbd2f52ab9ee2a0c2fb5a26dc731fff4e80f3aababa9234cec8c5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links to external PDFs hosted on disposable domains, a common technique for SEO poisoning and distributing malicious content. One of the embedded URLs, 'https://cctraff.ru/strik?keyword=aegis+solo+factory+reset', is identified as a known malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a malicious link farm designed to lead users to harmful content.

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=aegis+solo+factory+reset In PDF document text
    • https://site-1039199.mozfiles.com/files/1039199/87790349412.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/regekawomegizoruvaziz.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/65445770094.pdfIn PDF document text
    • https://site-1043908.mozfiles.com/files/1043908/jedore.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/96568230895.pdfIn PDF document text
    • http://koledi.sonorandesertvoices.org/uploads/1/3/1/0/131070171/2941382.pdfIn PDF document text
    • http://files.fittedkitchencentre.co.uk/uploads/1/3/0/7/130776885/b26cb1de72.pdfIn PDF document text
    • http://files.fermatathegreatpause.com/uploads/1/3/1/4/131406403/1791788.pdfIn PDF document text
    • http://files.belezzabrides.com/uploads/1/3/1/4/131455832/1402466.pdfIn PDF document text
    • http://files.rnativephotos.com/uploads/1/3/1/0/131070689/607ff9.pdfIn PDF document text
    • https://site-1043933.mozfiles.com/files/1043933/kamupanapupilimagunebir.pdfIn PDF document text
    • https://site-1037163.mozfiles.com/files/1037163/ritoketesinowu.pdfIn PDF document text
    • https://site-1040391.mozfiles.com/files/1040391/fenafuzejutiwudelog.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/1463ae2f-24b9-42ad-974a-582e710d5dbf/22256001756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064c4f86-5f32-4a90-b208-7b8755e9546b/46911402905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a886e16a-11c6-42a0-8623-a878bff195e3/rowujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf12ca2-61bd-4d13-8dfa-196bd208c870/vapan.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_off000076eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 5140 bytes
SHA-256: 85b90d8115dcb211c7422a3d60b5a6f3e432fe76b208f08807274dc4a7ca6347
font_01_sfnt_off0000888d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888D 10524 bytes
SHA-256: 65137e9b84c91c9eb03c1d548a4f2695e79bc7162e73bb001b5c3d542245a732

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