Malicious PDF — malware analysis report

Static analysis result for SHA-256 4398ed83cbc7be0e…

MALICIOUS

PDF

74.8 KB Created: 2020-10-25 17:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7b724a480885ea62ca95fb36eace38d7 SHA-1: 930f985e0c8e647480e134a4eb2005f5d747c991 SHA-256: 4398ed83cbc7be0ece35fad70cb1b22515c2a97f0d557331f00b3341bf757fee
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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=fundamental+theorem+of+calculus+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5f8bfde54bc6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f94f72d44e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8be9df6d8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5f8dd4227bdd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f895c55b46da.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/1/0266/9238/6999/files/1227981807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7994/0296/files/gmc_acadia_2020_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/98322281891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1946/7934/files/59933096531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5255/6184/files/27807444273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666d62fc-0dcf-4d4c-829d-acbf5bd3a2ef/77655749865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492c3252-0c95-4c52-812b-5d7e21d2a582/xilutasebekijomalize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937f8ad0-9fcd-484a-908c-d438b71399d7/jepejesawakewojikaxigix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eaf7a25-d5d2-4792-8b27-5eb85b51e858/61012904356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dac4bdc-7e44-4051-8fa5-f7725d222fa4/resumo_da_infncia_recuperada_de_fer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e9a204-9933-4722-aa5c-ee7febc639e7/65168949924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4610f486-8adc-4e42-9c26-63b94087d289/foduvugavitirefagifes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5251db-7902-4182-82bb-cedc2bdc920f/69878847391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e213fac-dba0-457b-a567-e103e1ffd233/gemilepibiwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24fcd5d-936a-41e6-8cb9-e2bea481b062/95252722569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bfa5ba-721e-4890-9b7c-0b2486fefce1/gomubovamolaxuvom.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 5352 bytes
SHA-256: ba3dbec8956e44dd56f68198640e851cdf18113e86f0261fa9c13189d7b00ba7
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 13932 bytes
SHA-256: 3bb9f95d579285c2dcda1ee590c51961018ca26a69d3dc2ff47f84d531444d4a
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16392 bytes
SHA-256: b15ccd1328322315538da0915b61b61b53225278707cc62aa24902ff24c66a89

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