Malicious PDF — malware analysis report

Static analysis result for SHA-256 182c357a0f7d027e…

MALICIOUS

PDF

44.6 KB Created: 2020-11-02 23:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c2ad55959e1a8382bf93a88e3dfcc4e1 SHA-1: 8b77452da658e70e2064cc7ea49576e017a32e82 SHA-256: 182c357a0f7d027e0cc7f2e4d2d8fe3344a712aeace5b796e739952ec717ef82
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic 'PDF_SEO_LINK_FARM' further suggests this document is part of a larger infrastructure designed to distribute malicious links. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly indicate malicious intent.

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://ggtraff.ru/strik?keyword=ans+2020+annual+meeting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_5f9f9e8cb4287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f943e0e9c2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f893965ec21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f904d5278f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f9760b7d90e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f9fdf8f2c3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f8cf8253dcdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f9d6bcb7bfc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f8fdeec7e57e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/57198821820.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/11629646517.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/animal_farm_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/hot_air_greenhouse_heating_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/7835/8437/files/tibup.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/zibogopegowiduxor.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/77486441644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8299/8449/files/cours_marketing_stratgique_ofppt.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_off00006fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 5172 bytes
SHA-256: 2b4dab8fe4c5c88a19e9187a672d4f3fcff04fc120ee1fedc22fe2329677faa5
font_01_sfnt_off0000812a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812A 10584 bytes
SHA-256: 4b3fd3d3e971bb83ae050739678bf655366b14f8a53298b32aae684dcf459c44

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