Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a29d2f9e9d8815…

MALICIOUS

PDF

57.4 KB Created: 2020-10-28 09:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b99f78d6134721f504a79fa7517ab9a4 SHA-1: ec4ce4bc0be7ab9ff8f68c9e4f48fb09705e5088 SHA-256: d3a29d2f9e9d8815595db46557a7d11bb97bc4cc80eaeea6d5de594cc457bcec
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 large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of such links, which are a primary vector for this attack.

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/123?keyword=teaming+with+microbes+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f9003baba972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5f98902d89115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5f990799a5f53.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/rumalax-gixasufusez-labunajigom-popado.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/gepoxizusipo_sukogabe_bapenupaxas.pdfIn PDF document text
    • https://votusaponepo.weebly.com/uploads/1/3/4/4/134471583/burigugaziwu.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/8d5f6f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f8e0bef30ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5f98e059dea3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f92303ed0dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f8b4a30ba516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f9663ec3b1af.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/zetare/lukude.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/84809882395.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/nafipofobipasorixolof.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/bawebovezaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/cabinet_ministers_of_india_2019_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/adjusted_present_value.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/java_basics_tutorial_free_download.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_off0000a1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CA 5444 bytes
SHA-256: 20f7e692bb1bc4e87fd31eceb584640a2c25e5f84e2d125ec511623feb0147c9
font_01_sfnt_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 10488 bytes
SHA-256: 5c131fb389ab05b2eb64e5869159ff3e83ad1944f19fa97e24fd5cf6968819b2

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