Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5219150ce51334…

MALICIOUS

PDF

55.7 KB Created: 2020-11-05 16:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4257db7d4b8381ecb1e0edfb81795a79 SHA-1: dbcee73918ebce87f95c89b00fd7005349b38e77 SHA-256: 9f5219150ce513346ea100c413f9a3191f8d30a1097c678914f3b5a60bd2c33c
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://gettraff.ru/strik?keyword=easy+mario+piano+sheet+music+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8f5a0380985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f9edc7c78a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5f8f59c285dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f88c6d88d3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_5f9fba018db27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f9bf2566ed04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f8e79e06652e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_5f99cfafd504a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f87e6d9bf77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f8907da7c431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f90820c3c6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8d5f11d861d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f8ea3c6652a4.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/1/0502/4743/4440/files/kcet_syllabus_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/salisekoxufibamagise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9955/2663/files/muwaburijamowaxifugiwil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 5280 bytes
SHA-256: b3e67a86cb6da46e7555b36d47703e1da8fadb886e497f547bb8e02347c7d39f
font_01_sfnt_off00009803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9803 10860 bytes
SHA-256: ffeb39c5d34be18186672de18e7b2effd381fd6fa72b9cae79aa9c882a5229f2
font_02_sfnt_off0000bc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7C 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52

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