Malicious PDF — malware analysis report

Static analysis result for SHA-256 403b43b25a5a2d6f…

MALICIOUS

PDF

68.7 KB Created: 2020-10-16 18:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 170dc63b711c69b5d531e3498769a9ba SHA-1: 5e228db9849c19fe8dbf1f5b479e57ca902d26d3 SHA-256: 403b43b25a5a2d6fb854690d3e0d528246547016e3b9dee09a1b5c388c604437
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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=dinamicas+de+bienvenida+para+jovenes+adventistas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f874ff6db0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8948db49a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f87b0984f45f.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/bc2bcb788b.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/2872142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6180/4693/files/ray_bradbury_the_city_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/vutizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4424/7973/files/xogowadawakop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6930/3701/files/74419765950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8625/9387/files/bamimevofukobanurapaxiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618d097d-9864-418e-a418-8b10c632ad92/70868327916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e9564e-470f-4942-84c8-fb7d73f18750/kogixomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a156343d-b1f7-46fa-9e02-9d6bfa31e807/87401354611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5795fd4d-0b96-4ffb-8e54-19eb87a213fd/pofupedevirel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc50348-1522-4c77-982a-1472ca707a66/visalipej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfefc16-2ca1-4cb5-9ddb-89884bc6777b/banorajunufazar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ed9eb6-5686-4563-8901-1d321fcbdae8/bejuluporazulafil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f40e277-2f45-495c-b4f0-3d04d2488b17/83741299132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e67434-c930-43aa-97d5-cbefad84532b/20058464273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222a933e-7622-45ff-99c1-4b7ab045f6e6/jelimosizotevokosuvuxoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6da5f0a-bb63-4f35-83de-cd63667ce5af/33469528065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbde8497-7030-455c-96d0-621f0ed15114/92065597406.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 5252 bytes
SHA-256: ea9e097db471761414dcb43bec1b957eb1cb2fa75bf4e46ed24ac74e05762e86
font_01_sfnt_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 11516 bytes
SHA-256: 45db871b35c0915a4a5d5cf5850edc3d97f7cad5ee4574fbde2725e81373cc63
font_02_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c