Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c70fd3f8600a77…

MALICIOUS

PDF

103.2 KB Created: 2020-11-01 07:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a7807871d5ef665d248b6f94587d0605 SHA-1: e68010d449a4a4b47dd2385a642b2f7efaf4a801 SHA-256: c5c70fd3f8600a771effdf288774dc4763c0deee996bd5bb3263254b5e273288
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link and a link farm on disposable hosting. The document body contains a URL that matches one of the identified malicious links.

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/strik?keyword=read+mere+christianity+online In PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/muluk.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/vatopudomi.pdfIn PDF document text
    • https://gujidasudaximuv.weebly.com/uploads/1/3/4/3/134384457/7727801.pdfIn PDF document text
    • https://moleresudiba.weebly.com/uploads/1/3/4/4/134447347/matidivonolojuveleme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8af6aa3f531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f888aeaf3663.pdfIn PDF document text
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/5080660.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/supom.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/da345e70-81fd-4b76-a761-3c51a058d549/21420201718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256991a2-d87f-45ea-ad00-bdbf9ec61961/computer_networking_a_top-down_approach_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0be255-dedd-46a9-9767-d8d51037d00b/aprender_sueco_portugus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3200/0696/files/zoom_game_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3103/4539/files/bus_duct_installation_guide.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_off0001578c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578C 5288 bytes
SHA-256: b7a4e3b9cf9853a4ec80763aa95b31c10b15a822ddedc9d0951030380edbdf44
font_01_sfnt_off00016968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16968 11308 bytes
SHA-256: 4a38619404d4842dc7d39675710c9834ce5dad08925aaf13a43d226d1d997134

Open this report in the interactive analyzer, or submit your own file for analysis.