Malicious PDF — malware analysis report

Static analysis result for SHA-256 5327cde933172268…

MALICIOUS

PDF

50.0 KB Created: 2020-09-30 01:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b997801c234a89080ed0c24149257e4 SHA-1: 3c06f345011160dc85542272f8837114a54efe8f SHA-256: 5327cde9331722687dcf776934455c512d16325868e09481a932295ed0730b5b
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 pointing to external PDF files, many of which are hosted on disposable domains or known malicious redirectors. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=bandura+observational+learning+pdf In PDF document text
    • http://files.hollywoodfashionmerchandise.com/uploads/1/3/0/7/130738596/dozezifid.pdfIn PDF document text
    • http://demipope.ejwoo.com/uploads/1/3/1/6/131636698/1c103f2.pdfIn PDF document text
    • http://files.orientlodge.org/uploads/1/3/0/8/130813317/023fddc3b1.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/86572500919.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/3798679008.pdfIn PDF document text
    • http://kixinuba.carolynscreationsminiatures.com/uploads/1/3/0/9/130969352/xibumegumokitewupi.pdfIn PDF document text
    • http://files.christamarialermhayes.eu/uploads/1/3/1/1/131163732/gebutobimisaxoporiwe.pdfIn PDF document text
    • http://files.21group-of-artists.com/uploads/1/3/2/7/132712099/diwebixe_kedimerozi_vokisik_badilikafoxor.pdfIn PDF document text
    • http://files.brilliantdesignmontessori.com/uploads/1/3/2/6/132682535/894480.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://cdn.shopify.com/s/files/1/0431/7052/9436/files/saints_row_4_cheat_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/kikepugavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.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_off000076db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 5340 bytes
SHA-256: 3d03549cfb4c48b9e65a547730b3e94d8cb9daab1b2bb404e041b58e162e7502
font_01_sfnt_off00008915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8915 10472 bytes
SHA-256: 12abd39d7aa5cd80e5d879be0a5a95a18cde33d230dc742bae9c35166860a8cd
font_02_sfnt_off0000aca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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