Malicious PDF — malware analysis report

Static analysis result for SHA-256 040dc692d0ab413b…

MALICIOUS

PDF

60.6 KB Created: 2020-11-18 01:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e93e411ee47b63d48d708c8c1ae92ff7 SHA-1: d1f5d2dcf43a1bde30343855fc61b12eee191e29 SHA-256: 040dc692d0ab413b104ddb4fa5c55d4d0a7357d18b7c850807ad7fdde62aa313
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to the AASHTO manual and wkhtmltopdf, suggesting a lure document. No scripts were extracted, but the presence of malicious links is a strong indicator of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/strik?utm_term=aashto+manual+for+bridge+evaluation+3rd+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fa065531d9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_5fa5942a2469b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5f9a9642e890b.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/nilubodeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f9a076e58d67.pdfIn PDF document text
    • https://koxokigibobov.weebly.com/uploads/1/3/4/6/134600250/vusupiz.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/sover-goxixejuxipilas-sibekuvuf-dewete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fb2bb4a66a73.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/riwamevuf-karur-kuwebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f8be34829185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/from_inquiry_to_academic_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561d9e60-1c0a-45ed-86ab-52321056fe05/65677209392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c0f1fd-7e35-4acb-8e36-3fd42b7919b1/microscopic_examination_of_stool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fad276-f955-4828-b18b-a1cab1c1a886/79247514099.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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 5676 bytes
SHA-256: 9595de76d9c702f4969386cf0183c9117ea7cd8fd9a579514472f0eb0e304543
font_01_sfnt_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 9964 bytes
SHA-256: af6bda903dda62a592ff14596794c283f43e24fe2ab16908300824f1fd9a9857

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