Malicious PDF — malware analysis report

Static analysis result for SHA-256 5199d3d6ab9c69bc…

MALICIOUS

PDF

37.1 KB Created: 2020-11-07 02:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f1441a278fe337542d2d45d0912eee33 SHA-1: 70697559a2f952a43ce36013d517f5ac6d359938 SHA-256: 5199d3d6ab9c69bc15ac7f7e1fd96610f9ac961b560534ae31046435623a16c7
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various external websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to manipulate search engine results or distribute malicious content. One of the embedded URLs, https://gettraff.ru/aws?keyword=watchcartoononline+tv+demon+slayer, is flagged as malicious.

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://gettraff.ru/aws?keyword=watchcartoononline+tv+demon+slayer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f93e2187a83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8edee5c3556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f875f7c10e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fa5567ece9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8b513d6f93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5fa1a87ee67d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5fa46303771a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://mujejikep.files.wordpress.com/2020/11/lagabevu.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://lukamukiza.files.wordpress.com/2020/11/atl_2006_movie_download.pdfIn PDF document text
    • https://pokavatirog.files.wordpress.com/2020/11/16651957553.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/nifim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5141c537-3e63-4065-8c56-85a5999f0e61/vowokatemusuri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44A1 5144 bytes
SHA-256: a1c064f5f1f2bde399386009b8b3826cdd0bfd0578cb9e29ac5ea0eb75a7de28
font_01_sfnt_off000055f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55F7 10504 bytes
SHA-256: 913f6e0503f273d52d0ac9c6939be1254791e850ae3a5e2706e7b93d47c5bd85
font_02_sfnt_off00007942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7942 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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