Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f172575a40be4d3…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 15:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4ee3ebca8a11ce8d8e844061dbd8359 SHA-1: 959e545268d748c857fbbec4cdd7e63dc88a659e SHA-256: 2f172575a40be4d3c295ac3c7f62efaca4c7dae7131a5be6a7dad0184c1701e0
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with heuristics indicating it is a link farm hosted on disposable infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure. The document body itself appears to be malformed or obfuscated, but it does contain URLs that are likely used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://cctraff.ru/strik?keyword=boy+scout+rank+requirements+2016+pdf In PDF document text
    • http://nufavav.thebagscollection.com/uploads/1/3/0/7/130740597/878c9a28.pdfIn PDF document text
    • http://mipetupaw.auntiearwenspices.com/uploads/1/3/0/9/130969742/0e6cdeae6e7a749.pdfIn PDF document text
    • http://files.drbrewer.net/uploads/1/3/1/4/131438891/retelux.pdfIn PDF document text
    • http://files.leadleaderlead.net/uploads/1/3/1/6/131636697/rovokamor_vifovebufo_fudosow.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/18926727930.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/38682649544.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/resuzasofetaso.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/8113941292.pdfIn PDF document text
    • http://ritojelol.mikesequipment.com/uploads/1/3/1/4/131453631/44efc.pdfIn PDF document text
    • http://kudug.amanda-d-pearce.com/uploads/1/3/0/8/130813651/zarirewazaroredagu.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/05c3d357-6e10-400a-aa7d-d3a85c30bf9b/gumafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa7c8ed-5051-470d-89f6-b5ac56ccf241/jeporagafoludibisiginozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea750c9-2458-4b2a-be82-e67c930f5406/merironegamawelin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6bd0ae-3c0b-454c-a6dd-f9fe318d6a59/75009320117.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_off0000628f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628F 6088 bytes
SHA-256: 66ebf25230f96d82a97637631e37cdb8717feba243ad609ef54bdcd5ae4571fd
font_01_sfnt_off0000774d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 10192 bytes
SHA-256: 85c06579cc90f45b7b4ca2b2b972c014d5f330723f4cd07457ad501a75b609cf

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