Malicious PDF — malware analysis report

Static analysis result for SHA-256 025053b50ee0674e…

MALICIOUS

PDF

50.2 KB Created: 2020-07-10 20:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 466e28c3b61a3de1846abb97e7a183b6 SHA-1: 4e6e66f1a06ca32ae8b078459a8d510970e7eeeb SHA-256: 025053b50ee0674efa061b46a390e58066d7245628a9999d8410ac2d003ad3f1
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a "Pdf.Dropper.Agent". It contains a large number of embedded links pointing to various domains, suggesting it functions as a link farm or redirection mechanism to malicious sites. One prominent URL is https://ttraff.ru/wb?keyword=aprender%20frances%20gramatica%20pdf, which is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the wkhtmltopdf tool and a URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9607922-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9607922-0
  • 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://ttraff.ru/wb?keyword=aprender%20frances%20gramatica%20pdf In PDF document text
    • http://files.mableandgrace.com/uploads/1/3/2/6/132695329/mazebofini.pdfIn PDF document text
    • http://files.cadellcabins.com/uploads/1/3/2/7/132712326/tugutumowumerak_medapolawo.pdfIn PDF document text
    • http://files.firestartergraphics.com/uploads/1/3/2/7/132741045/749fde7849.pdfIn PDF document text
    • http://files.nlg-pros.com/uploads/1/3/0/9/130969910/katixiratowapo.pdfIn PDF document text
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdfIn PDF document text
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdfIn PDF document text
    • http://files.opunakesurflifesaving.com/uploads/1/3/0/8/130814513/gezitowejukejekojuko.pdfIn PDF document text
    • http://files.custompaintingsbyden.com/uploads/1/3/1/6/131606271/mimak.pdfIn PDF document text
    • http://files.jamestylor.com/uploads/1/3/0/8/130813931/6ae6b4ab5f.pdfIn PDF document text
    • http://files.handmadebylouisa.com/uploads/1/3/0/7/130775827/25f7f89e987e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://konuvemove.files.wordpress.com/2020/06/73621786921.pdfIn PDF document text
    • https://sevimetemexo134467215.files.wordpress.com/2020/07/leduguf.pdfIn PDF document text
    • https://bizusiwe.files.wordpress.com/2020/07/wolanofede.pdfIn PDF document text
    • https://zaferogo.files.wordpress.com/2020/06/jejepogulofedepewex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 5112 bytes
SHA-256: a791106c873dca695da52d86880186724f858d382b56816a5edcbcc4e23f19f2
font_01_sfnt_off00008b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 15420 bytes
SHA-256: 0d1f51e077fa25ccb4f54e16cf68ed59eb326af60b264f7db19d5a167d43d78c

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