Malicious PDF — malware analysis report

Static analysis result for SHA-256 553a64a5654622ba…

MALICIOUS

PDF

39.1 KB Created: 2020-09-30 00:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bcf924abd34706583b7e4de0f61d025b SHA-1: 3437ec5aa24ea5dd8fea95a1f1c3745677c48e52 SHA-256: 553a64a5654622ba1db53c952d57677f44939783a6173318b0e6790d3ae2ed33
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://ggtraff.ru/strik?keyword=cantilever+beam+theory+pdf In PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/9434964555.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/43388467177.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/98381782661.pdfIn PDF document text
    • https://site-1037886.mozfiles.com/files/1037886/jegudosuberotivom.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/59647393393.pdfIn PDF document text
    • http://files.indygreencongregations.org/uploads/1/3/0/9/130969160/2855870.pdfIn PDF document text
    • http://files.adventureswithsonatsays.com/uploads/1/3/1/3/131383959/vekafipoderodemu.pdfIn PDF document text
    • http://xibonuro.ct-fig.com/uploads/1/3/1/4/131407408/lowabuwugomumux.pdfIn PDF document text
    • http://files.kilthorpeholidays.com/uploads/1/3/1/3/131383813/sudowisatuzapu.pdfIn PDF document text
    • http://files.schonedanes.com/uploads/1/3/0/8/130814208/3836d225390c44e.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/6846861c-4d2f-4e4b-bbf3-1cc3037829f8/25202183954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4823/8241/files/braum_lol_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/applied_research_examples_psychology.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_off0000593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x593B 5312 bytes
SHA-256: f2a7b278730a99841273ce8cb45b5fb2e74fe3fb3961111a6889e17c2833d2a5
font_01_sfnt_off00006b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B27 10872 bytes
SHA-256: 11d5e7e489c51ed7881b01faecc0301d0d1a36ee3f91a1c58590dec8b4248f5a