Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a814018303a8529…

MALICIOUS

PDF

45.9 KB Created: 2020-10-06 14:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c1627b2565b14c62853071c5e35c1481 SHA-1: a2bcad2fb469aab1f1365e7425aedabdbc715a4f SHA-256: 7a814018303a852974249ecaa5a3e017dc3cf63101758e403ca94c5de46fdbb6
184 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body, though partially obfuscated, contains a URL that appears to be a lure for installing Windows XP on an emulator, likely directing users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of redirector links confirms a malicious intent to lead users to harmful sites.

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/strik?keyword=install+windows+xp+on+limbo+pc+emula In PDF document text
    • http://files.albertfpark.com/uploads/1/3/1/4/131437604/8d2813ef29.pdfIn PDF document text
    • http://files.exchangerjessi.com/uploads/1/3/1/4/131453636/daguriterox.pdfIn PDF document text
    • http://files.mlabca.com/uploads/1/3/1/8/131857465/1e571a.pdfIn PDF document text
    • http://files.woodlingsart.com/uploads/1/3/1/4/131406478/nuzejefubetesuvozi.pdfIn PDF document text
    • http://files.fueliachemicals.com/uploads/1/3/1/6/131636990/penawafizafupog.pdfIn PDF document text
    • http://files.sgsmi.org/uploads/1/3/2/7/132740241/fajufafex.pdfIn PDF document text
    • https://site-1042888.mozfiles.com/files/1042888/fikibomovafopagafemivevis.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/valedoza.pdfIn PDF document text
    • https://site-1037907.mozfiles.com/files/1037907/gekupojetidobosulu.pdfIn PDF document text
    • https://site-1039897.mozfiles.com/files/1039897/25589350497.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/1/0486/5923/4984/files/recetas_para_hacer_el_ayuno_daniel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1E 5360 bytes
SHA-256: dbbe2e2abbf99a3e65ce676fe19ec30625f74969266ad0a62fd699d7fa59f072
font_01_sfnt_off0000715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 10100 bytes
SHA-256: 368e3e91dab6480f60d3e560ffb7ba379f8e3ca2880eed3b24823d2eb7a21fc3
font_02_sfnt_off0000942f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x942F 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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