Malicious PDF — malware analysis report

Static analysis result for SHA-256 2497992f03b5f243…

MALICIOUS

PDF

39.6 KB Created: 2020-10-01 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30ef15ff1c793640388fcfed1f383033 SHA-1: 69f5bb10b75f817742bc6e4c852febca4fa5172e SHA-256: 2497992f03b5f2435acfb84e50e14c3f73459e8b519152a322f4b66ff80087aa
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The document body, though partially corrupted, contains text related to 'Aneurisma cerebral causas pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent.

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=aneurisma+cerebral+causas+pdf In PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/23295564090.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/97017617469.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/95749436608.pdfIn PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/71190306054.pdfIn PDF document text
    • https://site-1036833.mozfiles.com/files/1036833/25521169909.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/wotogapi.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/gofupu.pdfIn PDF document text
    • http://kekuzo.insightcounsellingtoronto.com/uploads/1/3/1/4/131482993/1549656.pdfIn PDF document text
    • http://files.explainingmaths.com/uploads/1/3/2/7/132712447/tisex_vuviz.pdfIn PDF document text
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdfIn PDF document text
    • http://wapes.jonesparkview.com/uploads/1/3/1/1/131164456/c0e9bf76f7880.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/1/0439/4595/1400/files/biblia_de_estudio_pentecostal_reina_valera_1960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/4252229819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/actividad_epileptiforme_de_espigas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/xotab.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_off00005e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6E 5432 bytes
SHA-256: a4862064172b30ef6aacbdffb3f9cee950540f839f4c9fa6b73e3e7a4ef5dfd4
font_01_sfnt_off000070c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 9820 bytes
SHA-256: 19834e4979a67e04a44bed44bae0f9cb2a33c627c827e4cc1ac364980996f8ce

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