Malicious PDF — malware analysis report

Static analysis result for SHA-256 6586bec1835909ee…

MALICIOUS

PDF

34.5 KB Created: 2020-10-07 22:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0167684e6f1946cb063feebf41d658a2 SHA-1: 786ff3ab88bb043e15705c3c01ce6f9ae6615d55 SHA-256: 6586bec1835909ee3852ffea29834379a3ce57d8b179965d9d3853209c5036d6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting, and one specific URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains the identified malicious URL. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware delivery.

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://gettraff.ru/strik?keyword=gateways+to+art+understanding+the+visual+arts+second+edition In PDF document text
    • https://site-1043176.mozfiles.com/files/1043176/41075134059.pdfIn PDF document text
    • http://sowosa.quillskywritings.com/uploads/1/3/1/6/131606598/pujaxile_wejawipu_diduso.pdfIn PDF document text
    • http://tomewino.rebeccakeeshin.com/uploads/1/3/1/4/131453870/ruxusubabu-wukidi-faxusisusipam.pdfIn PDF document text
    • http://files.palaunisc.org/uploads/1/3/0/8/130813692/poweladuwojame.pdfIn PDF document text
    • http://files.sportstraumalondon.co.uk/uploads/1/3/1/0/131070799/225cc03.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/53290946653.pdfIn PDF document text
    • https://site-1039885.mozfiles.com/files/1039885/2719561268.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/1/0437/9390/7869/files/luvomoserijesoduvulizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/zijupaviwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8494/9920/files/depojigebigusupad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4130/8320/files/nujolorowedijavirudulifi.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_off000046f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46F3 5484 bytes
SHA-256: 02d0b4d6a94d66c52e4874ad2351348ec439695f0b6d0eb243ba6f24d306e8c3
font_01_sfnt_off000059b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B8 10388 bytes
SHA-256: 40f5b08a9490e84f951d8a25ff79f6a2f27fc520e14d1d0406c108881df8fece

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