Malicious PDF — malware analysis report

Static analysis result for SHA-256 23408e14a71d5ab6…

MALICIOUS

PDF

41.0 KB Created: 2020-10-09 02:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f9515c5713f550a10b7be915554efa47 SHA-1: bd77d51f969b00925a2f5e86dd7a214177916c17 SHA-256: 23408e14a71d5ab6b05f1fa76b1bad17078050a9567bdd01d894f3a1ffb90717
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=attestation+letter+pdf In PDF document text
    • https://site-1040574.mozfiles.com/files/1040574/54505818912.pdfIn PDF document text
    • https://site-1039728.mozfiles.com/files/1039728/matavi.pdfIn PDF document text
    • https://site-1043115.mozfiles.com/files/1043115/39514293982.pdfIn PDF document text
    • https://site-1042729.mozfiles.com/files/1042729/36778605581.pdfIn PDF document text
    • http://xotosof.thoughtstoyou.com/uploads/1/3/2/8/132814930/6191896.pdfIn PDF document text
    • http://files.deansidwellart.com/uploads/1/3/0/7/130775878/364198.pdfIn PDF document text
    • http://files.diversityunitkncirg644.com/uploads/1/3/2/6/132681824/bivezabenasikukeke.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/1/0429/8512/8099/files/6.4_study_guide_answers_biology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6135/1078/files/prioritychef_knife_sharpener_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4211/9073/files/rodezixubogezigosoxidexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/lenitazesetopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/14235966624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1928/6174/files/fekejemejukagodak.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_off00006535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 5024 bytes
SHA-256: e498e7c9d54b6cbd3c8487ab9eec7765e05ca54acbf0089384428502a5fb7437
font_01_sfnt_off00007656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7656 9712 bytes
SHA-256: 3d0fd61b77e39952ca3d32471acabd3e80a14faff8670f7b1ee757999d5b38d5