Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d24247c4ef2c6d…

MALICIOUS

PDF

37.6 KB Created: 2020-07-08 22:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 42b3adf8637556b5794e72399d8767b1 SHA-1: 68d3e7ca685459d6f40304e0afdd3c98b16f1ace SHA-256: b7d24247c4ef2c6dfbbc9e8c57f52a67933ca998e4bfec74064ae304630bbf5d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, many of which point to suspicious domains and are likely part of a link farm. One prominent link, 'https://ttraff.cc/wb?keyword=cloherty%20and%20stark's%20manual%20of%20neonatal%20care%209th%20edition', is identified as a malicious redirector. The document body, though partially corrupted, contains similar URLs, suggesting the primary intent is to redirect users to malicious sites, potentially for phishing or malware delivery.

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=cloherty%20and%20stark In PDF document text
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdfIn PDF document text
    • http://files.tiaramedina.com/uploads/1/3/0/9/130969984/tobet.pdfIn PDF document text
    • http://files.caseyharvilla.com/uploads/1/3/2/7/132712214/vevuzupakaki.pdfIn PDF document text
    • http://files.tkestateliquidations.com/uploads/1/3/1/4/131409055/dde65d.pdfIn PDF document text
    • http://files.jimgymsupply.com/uploads/1/3/0/9/130969532/633868.pdfIn PDF document text
    • http://files.nalcbranch489.com/uploads/1/3/0/7/130739658/vaxoravufu.pdfIn PDF document text
    • http://files.simaspace.com/uploads/1/3/0/8/130813885/2527676.pdfIn PDF document text
    • http://files.mootingsyndicate.org/uploads/1/3/1/4/131483253/lewotidedimitufemini.pdfIn PDF document text
    • http://files.surgtech101.com/uploads/1/3/1/6/131606720/8934448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gepuxulifa.files.wordpress.com/2020/07/kewakebibowolivewuzem.pdfIn PDF document text
    • https://zomazezifa.files.wordpress.com/2020/07/24315332807.pdfIn PDF document text
    • https://ligobabimogo.files.wordpress.com/2020/07/zomagurevupamaga.pdfIn PDF document text
    • https://sinezuve.files.wordpress.com/2020/06/40764145642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.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_off00005453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5453 5524 bytes
SHA-256: 91c79c519cb067dc3484c5f86281a70053ee83768ba771b876427eebecea93b4
font_01_sfnt_off000066f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 9992 bytes
SHA-256: 233d5214fb03c8f8ff42a6b5c824d19b4f7c7db401edb8d060c1d04aec3a4301

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