Malicious PDF — malware analysis report

Static analysis result for SHA-256 c990248725f8d6be…

MALICIOUS

PDF

42.1 KB Created: 2020-11-03 21:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-31
MD5: f7f18601b97e60411f3220b46687ca80 SHA-1: a4c9dd3b295cf929fcfde5798fda4dfe84304b8b SHA-256: c990248725f8d6be4df50f0e5d72f875c7e71ccbd4e710b302afc02f92cdc0a0
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=guide+me+ever+great+redeemer In PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/ripoxijalenigel_milutak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f86fc414a275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f888da1b6077.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/6942172.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/fodesin_jexobotozoral_kuxikuwasogigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f8aa2775e7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8e679257df1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5f990407f0acb.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://uploads.strikinglycdn.com/files/5ac7c465-7e2c-4167-87c1-e8540041b904/42706329032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3020dad8-c6bf-4f78-a9a5-d5ab42339a16/funciones_del_gerente_de_produccion.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_off000059d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D7 4692 bytes
SHA-256: b896c130d66a12b3b3c1e35039061c4aa99fe3b009a8df29d582f812e57547c7
font_01_sfnt_off000069d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D1 10500 bytes
SHA-256: ffe9dbe6eb2fce070e9f6e69148401d6285e64ccbe50a4f621a58f393d058673
font_02_sfnt_off00008da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333