Malicious PDF — malware analysis report

Static analysis result for SHA-256 432023f76ca50e11…

MALICIOUS

PDF

40.6 KB Created: 2020-11-09 15:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b0fc0399cf2403eec799769233b7d6 SHA-1: d517d763f697c3dcc2ba6e530b7635b11a0ed69b SHA-256: 432023f76ca50e115fbace0f75013f90960e854ecee44637566c1edf2510f749
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 document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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/123?keyword=foster+middle+school+staff
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f875c083ecc1.pdf
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5f9ecc1a913eb.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/tozegi.pdf
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f96e2238f86a.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_5f9e632b42d96.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f87a2f026dab.pdf
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/nomulomavikin-merofelegi-jefuba.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/3819095.pdf
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8b6eeb71ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5fa83ba6ca7e9.pdf
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5f98c21941e56.pdf
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f916504b4dea.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f8f4b5ee85bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sazixipame/current_affairs_2018_in_english_with_answers_download.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/best_online_concert_tickets.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_off000061bf.bin
20803168a3e9f05242ce3f1579210e7bf91487ad19d273c5a1c5c7712aa1d502
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5216 bytes
font_01_sfnt_off00007350.bin
f2615dbb31f9bca8d36ee8d27029990dc87726ad4e9da76aa28b61610ea75fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10056 bytes