Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb4b62a71e49574…

MALICIOUS

PDF

59.6 KB Created: 2020-10-31 09:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7c764a3d18178495e344236cb3c9aa2b SHA-1: 2acd560c5b47f4181fe7191cc16497ec874cf562 SHA-256: ffb4b62a71e49574ca0f53c092a89ca3cd93e87499698eb0c4c94fb8784933ac
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://cctraff.ru/strik?keyword=toyo+proxes+r888+sizes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_5f9d12fcb89f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f990a5733f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f88799e474d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f918093be387.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/fb383ccaee2b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f9c36c04ac50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5f8e90ae6a33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f8c83c26fe83.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://cdn.shopify.com/s/files/1/0502/2639/7363/files/30796259635.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/3648919740.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00005f23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5F23 13376 bytes
SHA-256: 6d4dcacba158e700f8eedd90fe793aca7ab5190153d593d64cd26f17f5cfc32c
font_01_sfnt_off00008929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8929 4536 bytes
SHA-256: 77bc0923f1f19491621e6e793164cb27384fc51e52125b456559e81b568aff60
font_02_sfnt_off000098aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 10872 bytes
SHA-256: 054296e00122b61c4d8cd1858e086a33fa7ef75b1ef195b7fe1104d016a25fac
font_03_sfnt_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 16164 bytes
SHA-256: b21434860209bcfa4faa45743010641f853ea3cc1b0bad42541eb31f339e130c
font_04_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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