Malicious PDF — malware analysis report

Static analysis result for SHA-256 423ef97bb8b94d3e…

MALICIOUS

PDF

51.6 KB Created: 2020-10-16 18:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7ae316429ca825e899a039868b42042e SHA-1: 29464e39bf2bddda98419a5523843df786d4944f SHA-256: 423ef97bb8b94d3e14e5faf22c76333f5347e6bb9d1717b9e0587d25421c9e19
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/123?keyword=recetas+low+carb+pdf+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872cbbe1cdb.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nipomomuka_gisotufeje.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/tolefogi_fiderute_lotozipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8942fc592a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8845cc7510e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f88c2d89181d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f86f97fec65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f88b7ca0c04a.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/diragamekalizut_relegujopalubas.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/jojulibikax-bigefotigew.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/bojugefel.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/9858b91f-b3c1-44f5-9b51-83972e03acf6/rubilopup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5820100b-6670-499d-bd1c-c0bd2bba9186/pevokuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e5ed4d-03d8-4d2a-b6d3-b4a71e996566/bexomivodajoratiweku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e362b9ab-07f3-4d11-a9bc-4d1acf312917/57892403200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7749/5712/files/61470654189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8099/8298/files/law_of_war_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/leponezumizaw.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_off00008b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 5560 bytes
SHA-256: 4f94cdc6d4d70013945aea07df6795b6285c973e918c6172d1716e3b163a4b20
font_01_sfnt_off00009e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E17 10484 bytes
SHA-256: af4e8ab5ff7e9440afe4d976cc28d604d28a589bb8372935ccef33766aa3a267

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