Malicious PDF — malware analysis report

Static analysis result for SHA-256 7257c3b441015825…

MALICIOUS

PDF

40.5 KB Created: 2020-11-02 23:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bb950437155bd7cbb07257d32cee5119 SHA-1: 22cccb350b615957340f7b09b0cc6a4169d9ece3 SHA-256: 7257c3b44101582532d71cc766bd3b70539135e7ef526b48cc85c46cf5106fab
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 what appears to be a link farm designed to generate SEO traffic. One prominent link, 'https://gettraff.ru/123?keyword=apple+iphone+xr+smart+battery+case+specs', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites.

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/123?keyword=apple+iphone+xr+smart+battery+case+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8f5e27923d3.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/virabizonukobikiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f9bc1f79fadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_5f9e92637d088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f8c0b274f7c7.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/177646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f99075941b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f970ebcd18f0.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/memul/atharva_veda_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/essentials_of_investments_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/culture_of_poverty_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/duwenapovubemilamazaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/business_english_conversation_topics.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

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F02 5472 bytes
SHA-256: 5cb558522398762560a1f7bfd6b4483679a15476542ec0b541440302dcc9f90e
font_01_sfnt_off00007174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7174 10512 bytes
SHA-256: 91ad82efd0575cb0bb5ab7104bab7d2007776a0dd0932df9717fdae7807695d8

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