Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f3f155c6be4f0c…

MALICIOUS

PDF

37.4 KB Created: 2020-10-05 11:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b835f6b2b6311434337d4fad9c54be29 SHA-1: ed9a4a036cb726f67e5d27b9cfba83433e9915ca SHA-256: 92f3f155c6be4f0c112b3960482b3521a84c9767523a222c4d08e138c11e1af4
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body text, though obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=scrabble+letter+tiles+printable', suggesting a lure to a malicious site. 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 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://cctraff.ru/strik?keyword=scrabble+letter+tiles+printable In PDF document text
    • https://site-1039360.mozfiles.com/files/1039360/27941190189.pdfIn PDF document text
    • https://site-1039777.mozfiles.com/files/1039777/15644247057.pdfIn PDF document text
    • https://site-1043053.mozfiles.com/files/1043053/21772727545.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/pizemowijek.pdfIn PDF document text
    • https://site-1039510.mozfiles.com/files/1039510/zimiloburibezobovolatiru.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/jupemagetulodakola.pdfIn PDF document text
    • http://files.bgreenyoga.com/uploads/1/3/1/3/131383838/1161802.pdfIn PDF document text
    • http://files.dagomardegroot.com/uploads/1/3/1/4/131483147/luvexukunifax_wonupuwopa_visinuxobudunuv.pdfIn PDF document text
    • http://jaganexi.lorrieboylen.ca/uploads/1/3/1/4/131438121/3513503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f86470-d903-40da-9ec5-1eb1008c5d30/gowisavuxetopelek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d531eb-ffbc-4e87-85b9-b05084074d15/17931735378.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5405 5168 bytes
SHA-256: 0fadb35ce29f0ecb20683e88150cbc92c46dcb6c4c5f6d16305161a54d5bb438
font_01_sfnt_off000065a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A2 10428 bytes
SHA-256: c2953bc2a13aa670bbf3fed0477612ad0335d53993e45448407ebce015dbb01f

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