Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa593e4254321c7…

MALICIOUS

PDF

47.6 KB Created: 2020-07-09 18:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: a1f3b0595c281974647c521678d8ff23 SHA-1: 0a16dd9e134150b9d126dcdef76773ba8c482811 SHA-256: 4fa593e4254321c7c39069cffa7e43ed32eb40150637a8fd9c0c98efb4de8988
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links to external websites, including a known malicious redirector at 'https://ttraff.cc/wb?keyword=adverbs%20and%20adjectives%20worksheets%206th%20grade'. The document body also contains text related to educational worksheets, suggesting a lure to disguise malicious intent. The presence of a link farm and a high ML classifier score further indicate malicious activity.

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://ttraff.cc/wb?keyword=adverbs%20and%20adjectives%20worksheets%206th%20grade In PDF document text
    • http://files.papercreationsbydeb.com/uploads/1/3/0/8/130873838/vojamitugusolexezev.pdfIn PDF document text
    • http://files.heatingbreakdownservice.com/uploads/1/3/1/1/131163561/bezixuvofemunam_dipevi.pdfIn PDF document text
    • http://files.24hoursforkaitlyn.com/uploads/1/3/1/3/131384735/gujigoz-wuxef.pdfIn PDF document text
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdfIn PDF document text
    • http://files.10thavenuerebuilders.com/uploads/1/3/1/4/131482926/pigedatened.pdfIn PDF document text
    • http://files.dallasmoderne.com/uploads/1/3/1/4/131454549/wesizoxelare.pdfIn PDF document text
    • http://files.aliennate.net/uploads/1/3/0/9/130969437/7643911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ronezas.files.wordpress.com/2020/07/48999222860.pdfIn PDF document text
    • https://gadovawu.files.wordpress.com/2020/07/badunowidiw.pdfIn PDF document text
    • https://kaxavuwomu.files.wordpress.com/2020/06/90103427008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76106621034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.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_off00007c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 5532 bytes
SHA-256: 8ad84ca1ecac85e7797da36ddc2fd634857aeade8cef4800158c28e3ef7f9ac5
font_01_sfnt_off00008f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F09 10144 bytes
SHA-256: 42a78b9b9e40616e059cf2c0e1d14c6ef4d4cff12ea7319225d5f8ea1af4a256

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