Malicious PDF — malware analysis report

Static analysis result for SHA-256 037b11564fcadb1b…

MALICIOUS

PDF

53.4 KB Created: 2020-10-12 05:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6edc68355951f0b71b14fc7120714cd4 SHA-1: efc4232072beafae7f2aed32589447a750f6b3dd SHA-256: 037b11564fcadb1bd5b36b53632765b4875cfceae1847061ad478582643d79bf
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 embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or redirection scheme. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=miseria+y+grandeza+del+partido+comun', is flagged as malicious. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be leveraging link farms for SEO manipulation or to redirect users to malicious sites.

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=miseria+y+grandeza+del+partido+comun In PDF document text
    • http://rowopevon.nanostitchlab.com/uploads/1/3/1/0/131070364/8582647.pdfIn PDF document text
    • http://sorebata.beradiantbyrebecca.com/uploads/1/3/1/3/131384281/mefefowepizike.pdfIn PDF document text
    • http://files.enrealexperttravel.com/uploads/1/3/0/8/130813489/giwivuraw.pdfIn PDF document text
    • http://files.gbicommunitygallery.org/uploads/1/3/2/7/132740905/2401958.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/48216084112.pdfIn PDF document text
    • https://site-1043893.mozfiles.com/files/1043893/6077726635.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/tasalituxezune.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/52504458900.pdfIn PDF document text
    • https://site-1038897.mozfiles.com/files/1038897/jotogavuxilozezixoniv.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/ef17084e-64df-4d88-93d1-09a52261253f/72878032266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d87d60c-32af-446c-85f0-a147f0421489/66908213076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050928c8-8de9-4d23-8181-2ced28822c60/lebanomagitiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293eb40f-33ca-403c-8304-dd1e9ee120ab/lekizebulewabubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656c5373-6ce5-41b9-ac60-3fa1df976776/5527274591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/74794649892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/richest_baseball_player_today.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7987/1911/files/22040459229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4112/0679/files/duxinakodixisev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1541/4175/files/renys_department_store_belfast_maine.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_off00008185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8185 5432 bytes
SHA-256: 9e0dc1278c344fa61c9246080210954f726f1b4e03d6f0412d8eb564a8f3eb69
font_01_sfnt_off000093f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F4 11008 bytes
SHA-256: a6827ea999edbe2306a349d0748bd731ab58ac3b6ce874dc16adbc0815f5679b
font_02_sfnt_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34