Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca360c31343316c…

MALICIOUS

PDF

40.4 KB Created: 2020-11-09 16:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186b9746afc986a3bf1cddcda9bd42e9 SHA-1: 57b80f8b2891a9dfff3b5b3bd35c381d59a109bc SHA-256: 9ca360c31343316ceb1ce08c0293f8d7bd97b7c0b4bc99bbae49a95dc63d16b5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains URLs that are consistent with the heuristic findings of a link farm and a malicious redirector, suggesting an attempt to drive traffic to potentially harmful sites.

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=copy+and+paste+fonts+online
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/3fcc6c6.pdf
    • https://cdn-cms.f-static.net/uploads/4473926/normal_5fa56ff935ec3.pdf
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/20fe23f8.pdf
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fa84a6805bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5f9a0a7534f6f.pdf
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f96ee28d122d.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f88a2acd3365.pdf
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5fa4d1f249bec.pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f88b25dea755.pdf
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f897ec72b86a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gofilafixu/zibawamorasifomaje.pdf
    • https://s3.amazonaws.com/nowokil/illinois_schedule_il-e_eic_2019.pdf
    • https://s3.amazonaws.com/tumasun/crest_middle_school_district_code.pdf
    • https://s3.amazonaws.com/vikukinumet/todoveve.pdf
    • https://s3.amazonaws.com/sugaguxagu/modelo_biomedico_vs_modelo_biopsicosocial.pdf
    • https://s3.amazonaws.com/rimepusox/magic_chef_furnace_g66-100d-1_manual.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_off00006195.bin
17e914ef3be8a0353c1536b0843b8f714ceb74be98a545ade36f26e37fd3eec6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 4948 bytes
font_01_sfnt_off00007288.bin
3cd691af3ae4222af4a3f3e041751bd56d5e39a8361fc61c9aa01d8369061741
pdf-font-stream PDF embedded font (sfnt) at offset 0x7288 9912 bytes