Malicious PDF — malware analysis report

Static analysis result for SHA-256 20822b1e2f299ff2…

MALICIOUS

PDF

51.4 KB Created: 2020-09-30 23:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 65646e9f021d36ed69f82ce792ffc489 SHA-1: 0f93d59c0af8a1c06c6a3bce032aabeca19962cf SHA-256: 20822b1e2f299ff2fa3c26ce0e14dee175f6c8bbdd71bca7895745e9a76c0712
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=pearson+biology+textbook+pdf+11th+edition In PDF document text
    • http://vosunuj.michaelshusko.com/uploads/1/3/1/4/131407592/memopamotimekuxotubo.pdfIn PDF document text
    • http://sowubifub.cefcolumbiamidlands.org/uploads/1/3/0/7/130739284/jegomesiroziwop.pdfIn PDF document text
    • http://files.springmorefarm.com/uploads/1/3/0/7/130775138/7480573.pdfIn PDF document text
    • http://files.shannonecameron.com/uploads/1/3/2/6/132695430/953582.pdfIn PDF document text
    • http://files.lorraineparishwriter.com/uploads/1/3/0/8/130873870/lobojixo.pdfIn PDF document text
    • https://site-1038782.mozfiles.com/files/1038782/lorabugasef.pdfIn PDF document text
    • http://files.theromancollar.com/uploads/1/3/1/3/131398091/04a13fc01ea1.pdfIn PDF document text
    • http://zigunoped.lydiamccarthyart.com/uploads/1/3/0/7/130776074/452f3e7a0a.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/d817745a-4e8e-432e-8503-7cf2bd8cc445/juxewajajurusot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b154ee9-4343-4aee-b156-8f12d79359b4/97231870371.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_off00008bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAD 5732 bytes
SHA-256: 18ed1a320550113068f04199f027397047556d62eb9a1bf18afd655a25687301
font_01_sfnt_off00009f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3A 9952 bytes
SHA-256: b6c7e997e2ea418fea2a6cb0c0b10c820331008ccf2662b17afd220ffdf0f3df