Malicious PDF — malware analysis report

Static analysis result for SHA-256 b519bfb579343f48…

MALICIOUS

PDF

35.0 KB Created: 2020-10-01 01:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 84e28a3c00014016e8366379dbb4991d SHA-1: 20b1b590f87b21cf4d5240e2ae2924a956b1d542 SHA-256: b519bfb579343f48bca1b492b649aa7add19471fdfd38b719421f403777911bb
184 Risk Score

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=urticaria+angioedema+anafilaxia+pdf In PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/kujegewuwagumofapiwox.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/ziwut.pdfIn PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/pujoxixidutovojumu.pdfIn PDF document text
    • http://files.karilehrart.com/uploads/1/3/0/7/130739263/5aaf27fb.pdfIn PDF document text
    • http://milonobi.thatsadormable.com/uploads/1/3/1/8/131856819/5686429.pdfIn PDF document text
    • http://waxul.littletheorem.co.uk/uploads/1/3/0/8/130874012/0c43518b6.pdfIn PDF document text
    • http://tufofalu.dynacomltd.com/uploads/1/3/2/7/132710677/233875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/familial_hypercholesterolemia_canadian_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0763/4338/files/95961666898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3757/0710/files/moliposafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce84682-2c62-458e-a194-c8087d4e05c7/lubunumegilabuzoginepig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc672dd-4e7d-4a0e-b3ca-333ac1010412/jepok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117ebc17-3648-4c5b-aca2-53a9bd122b79/5124714246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906a8612-ebb1-41e1-8b6f-cdf2b0ce0b1c/banitib.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_off00004c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C34 5356 bytes
SHA-256: ad61ab2ed8df4e86ac9b6aebb3281de038858766f3299409c30fa64d14ca6a7a
font_01_sfnt_off00005e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5E 9668 bytes
SHA-256: dd4c589aa220df0e086915556f25871bcd24f502212f6e505340748951eac394

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