Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a6c2e392f12356…

MALICIOUS

PDF

53.7 KB Created: 2020-10-31 22:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d0503bc615040f56ce6d97a5f1bb20f1 SHA-1: e4e685e9c9fb1b777bd8536fd767ceca6daa2fdc SHA-256: e3a6c2e392f12356dad263749d657b5f0fd7d121b036e8c6d7dfd22e72659d9b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable domains and are likely part of an SEO link farm. One of the initial URLs, 'https://ggtraff.ru/strik?keyword=300+kpa+to+bar+to+psi', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to malicious or spam content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=300+kpa+to+bar+to+psi In PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/f23f8b9c191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5f925277f1a78.pdfIn PDF document text
    • https://saxuvelimeno.weebly.com/uploads/1/3/4/4/134480096/f7a70a.pdfIn PDF document text
    • https://lewonodi.weebly.com/uploads/1/3/4/3/134330754/fiwiwaruxakezakaz.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/6341381.pdfIn PDF document text
    • https://xusegabisaxo.weebly.com/uploads/1/3/4/4/134463696/905ce14e82.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/ce02014a20d.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/4747758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f97eb93d5a20.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/8315006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5020/3797/files/fidafikadafoxaruvotiru.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC3 5196 bytes
SHA-256: 6109db74ae312a49ce8ed3f1e43bd7bb9062f7d49118836f28bec1c33cf2207b
font_01_sfnt_off00009075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9075 10680 bytes
SHA-256: 442d4fc0dafb960c0cdefc38c3a5f7a6282d143ebf7b79d1670aa16ce164b105
font_02_sfnt_off0000b50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50F 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

Open this report in the interactive analyzer, or submit your own file for analysis.