Malicious PDF — malware analysis report

Static analysis result for SHA-256 263bf8b45e6f8506…

MALICIOUS

PDF

49.2 KB Created: 2020-10-20 03:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07a5589a6f204dd4170fbbf35826895a SHA-1: 7b5f9630f0d2f01d1c24d26cc0bbcdc3fe0e8c58 SHA-256: 263bf8b45e6f85063473008e8e99ecc13d15ead67e1223cec350d312d22d677c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to disposable hosting services and redirect to a known malicious domain. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

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://ttraff.ru/123?keyword=cognitivo+conductual+psicologia+pdf In PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/gaxabigenobu.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/vafupunagijaxupufin.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/lewikusojar.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/jenerup-julavisurot.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/rikitiluzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f8829c9a7548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8d13217e13d.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/temiluf-renafelo.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/214903.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/goxefa_nubomonuvetafet_zidukobejaxig_welenipenuz.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/mofogobakil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f89b67438e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f892051cbf70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f896fd7d59c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f88823596db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f8aa6fbb91a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f8896271a6cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f8e2289932e9.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/001cb1ac-fadb-48fe-9196-e7d3cedf0d64/furomigajonox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4437e8a-005e-49dd-9f4f-74e3e52b5fa9/12580211146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ca2758-2539-4146-90b4-324a95a0aa3c/81140218524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad33a623-1f5c-4ba6-a7a8-bdf17534f1ea/balifitosasatodatugeboxa.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_off00008147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8147 5192 bytes
SHA-256: 29701478362b05d069bdd027b94bde88c37925e69947d859cb1e140f3e6e46cd
font_01_sfnt_off00009314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9314 10640 bytes
SHA-256: 89ca8c01e226bd7a79626ccdc60653e2d748643a3c6e9d7821748179ce0ca03d