Malicious PDF — malware analysis report

Static analysis result for SHA-256 b783f853cdef56fc…

MALICIOUS

PDF

52.7 KB Created: 2020-10-15 14:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d65e0f3b61cf9786ba8c8d070631557e SHA-1: e6ce54083125027f4592efeb4009955da5eea0d8 SHA-256: b783f853cdef56fc39bfd663fb9cd8b90a34d6203d117f28bd9dbb1f3136346f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with a primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL and a keyword suggesting a lure for users searching for academic papers. The ML classifier and heuristics strongly indicate malicious intent, likely to redirect users to malicious sites.

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=effect+of+caffeine+on+cognitive+functions+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f878111dd1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f879dc6aabbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f87b87c73083.pdfIn PDF document text
    • https://site-1039775.mozfiles.com/files/1039775/fozezuxazokifub.pdfIn PDF document text
    • https://site-1039654.mozfiles.com/files/1039654/44647955551.pdfIn PDF document text
    • https://site-1039642.mozfiles.com/files/1039642/bebepibo.pdfIn PDF document text
    • https://site-1043752.mozfiles.com/files/1043752/16717328158.pdfIn PDF document text
    • https://site-1040003.mozfiles.com/files/1040003/42317025820.pdfIn PDF document text
    • https://site-1039271.mozfiles.com/files/1039271/belazele.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/jexodupukoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c49b8420-175b-4084-896c-132fef774940/46443152359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ca6bc7-4bc9-4e2b-b9d1-ce74a7f89d7e/pafavan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f3c977-c60f-4fae-a2c0-43e7e20bacd9/fonuwibadetevuliko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213cdabf-7085-449f-b9ec-11db25bcf871/xiparadasixawewibogusone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32f778-b05d-4bea-8bad-aeceab0b6c28/26936238508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/hobo_game_1_passwords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4704/2728/files/emic_and_etic_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/pepuvupujeworanekakeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4116/3934/files/29950192291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6976/6302/files/converse_size_guide_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452f462e-a9a1-4964-8157-c937a0150c87/gutugojomutilewubalirevum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b80fa1b-5e17-42d0-8827-9856679fb9d6/juroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9766bd91-e769-4025-90e7-ed0284cf01f6/farigagavera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ab0f22-fa48-4542-b693-a35bdc9365fa/92815790190.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A6 5092 bytes
SHA-256: 787890c8c2ad536f595d51b7868206b6eec490f727cdaf7ba399fb56ed6992db
font_01_sfnt_off00009415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9415 10072 bytes
SHA-256: 16d42783ab622326ff04477ca2e08a7996de8d013df028b61c03223576568b6d
font_02_sfnt_off0000b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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