Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa2fe76e09e8837…

MALICIOUS

PDF

39.6 KB Created: 2020-10-07 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b8cdec53e917f024b2599afa656e795 SHA-1: ff926a8af6ff1fddf7a07387fe688141931d973d SHA-256: 6aa2fe76e09e88374e30b6855e731540133fae5bc0b3f5c835c93483623d8f6e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable hosting and redirect to a known malicious redirector. The document body, though partially corrupted, includes a URL that appears to be part of a link farm designed to lure users with search-like content. This suggests an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing.

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://cctraff.ru/strik?keyword=apertura+comercial+ventajas+y+desventajas+pdf In PDF document text
    • http://tuduvozo.jeannecorrigal.com/uploads/1/3/1/4/131408371/fobosuxitajelo.pdfIn PDF document text
    • http://files.greensbororoadchurchofchrist.com/uploads/1/3/0/8/130814030/maxabiwedavakoruzo.pdfIn PDF document text
    • http://files.salonbeauchesnestudio.com/uploads/1/3/0/7/130739571/592443d4ee21541.pdfIn PDF document text
    • http://files.daisiesandchalk.com/uploads/1/3/2/6/132681826/8042238.pdfIn PDF document text
    • http://juxox.antarestrakehners.com/uploads/1/3/0/7/130738779/nudusonemili_xemotusalera_mifuji_zaniduxajavator.pdfIn PDF document text
    • http://files.clinmicrolab.org/uploads/1/3/1/6/131636941/8217847.pdfIn PDF document text
    • http://ninoj.crgvt.org/uploads/1/3/1/6/131606469/levaf.pdfIn PDF document text
    • https://site-1039257.mozfiles.com/files/1039257/wimegexovajamixomepo.pdfIn PDF document text
    • https://site-1038401.mozfiles.com/files/1038401/wotujuvobidadove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e4cbd7-d77e-4178-8479-db2bd39db6bc/xisodegekasola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1d6c2d-0889-47f2-9f0c-9450fc8edc4c/11013507903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9ba9a3-142d-40d7-8478-940138c15f76/84851842240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b11bce-7a22-461a-93f8-f5f4b38befcd/62557386695.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_off000059b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B2 5528 bytes
SHA-256: 954215604575ea1f8381e9860c1e22a5ea7e9fb7ccf3a8f61841624b3883518c
font_01_sfnt_off00006c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7D 10852 bytes
SHA-256: 278c5748de5c5b488ec26b1bd5ce0dcd8855f2d4f04dc37e7a5f1d8d9867fe17

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