Malicious PDF — malware analysis report

Static analysis result for SHA-256 17562a39f377c0fe…

MALICIOUS

PDF

60.1 KB Created: 2020-11-08 19:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906f9c43052bc9d9f0487e8ea193fe74 SHA-1: 6cd4644f42952c40b024281de7b58aac6f2c7cb4 SHA-256: 17562a39f377c0fe2fdd61ce875a1be39b93379f86699f8cbd3c4c7d762355f6
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, forming a link farm designed to direct users to external websites. One of these links, 'https://traffmen.ru/123?keyword=jennifer+egan+age', is identified as leading to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and metadata, suggesting it is not intended for direct user interaction but rather as a vehicle for the embedded links.

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://traffmen.ru/123?keyword=jennifer+egan+age
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5fa4ac9baadfa.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/jujajevuvolowojo.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5f93c88460b69.pdf
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/5a067a71fa98791.pdf
    • https://pugojowu.weebly.com/uploads/1/3/4/3/134334477/421b639a13.pdf
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/wuzogajumitit.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/letizokukuwa.pdf
    • https://cdn-cms.f-static.net/uploads/4465690/normal_5fa739d760051.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/zeminemedubad.pdf
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fa7804cf15cf.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5fa5945a5394b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zomizekakigo.files.wordpress.com/2020/11/75558862147.pdf
    • https://s3.amazonaws.com/wiwamoxamo/weigle_2002_assessing_writing.pdf
    • https://puxefeko.files.wordpress.com/2020/11/suvenafoxababo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae50.bin
b067b35e664f895dd45b688c8e82cc659856c65886ec3f9f4ef92ac11c98a93c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 4716 bytes
font_01_sfnt_off0000be73.bin
c8767cd9eb65dd4ea1c4f09b1eccd66a6aad2df42eac6e186579131b2efe3602
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 11276 bytes