Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f76d8a4e8ae5cbd…

MALICIOUS

PDF

44.2 KB Created: 2020-10-05 14:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8cb931102ace74b9b5c24dd313c501ba SHA-1: 681edf8a5fb643e2da27192fc6e0666ae87456f1 SHA-256: 3f76d8a4e8ae5cbda405837768c7a857ca273b950b1b1af6679104203a474916
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, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable domains, indicating a probable attempt to lure users to malicious sites.

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=88+the+narrow+road+pdf In PDF document text
    • http://files.weavingenergyhomeopathy.com/uploads/1/3/1/3/131379039/natada_gavakalexuvina_tunupaganewopol.pdfIn PDF document text
    • http://pesam.trimfixsupplies.com/uploads/1/3/1/3/131398440/7b00b238b12f0.pdfIn PDF document text
    • http://files.bartlettlab.org/uploads/1/3/1/0/131070327/7599519.pdfIn PDF document text
    • http://bevemokus.jennibearbeauty.com/uploads/1/3/0/7/130738755/dudevobi-lugofid.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/31884455354.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/97284991920.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/42980508074.pdfIn PDF document text
    • https://site-1040319.mozfiles.com/files/1040319/40548024732.pdfIn PDF document text
    • https://site-1039932.mozfiles.com/files/1039932/75207291587.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/6817152275.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/18747912217.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/35632096788.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/21f80d72-6382-4974-8755-c488cc7d564b/47797966516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5173d11f-581b-4ca6-b0d2-89538213cd16/18823060125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f2536c-5b37-4f4d-a2b1-2d10b4051a0a/metexava.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_off00007051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7051 5108 bytes
SHA-256: f5d7195cf92d6eee25bec93ea772d3e8ad659c5326da60d82cd7ee9986423d58
font_01_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 10088 bytes
SHA-256: 88b605d39c65e167b5c58e7927ebafbf364fe9705262403f120b6a1378127673

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