Malicious PDF — malware analysis report

Static analysis result for SHA-256 8278afc24d90edbf…

MALICIOUS

PDF

50.1 KB Created: 2020-11-03 13:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: edb44113f7478e5a99670d7fd61164a1 SHA-1: 04cf71ad03a6d6dab1ca4aa20ada6e434c2308dc SHA-256: 8278afc24d90edbf467e6897f738a817f8074235eb041b19f4910e2b6d7ce60e
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://ttraff.me/123?keyword=dorf+goes+fishing+torrent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f988ea2c0c25.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/duwamud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8c0a190ebd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f92b11396c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_5f9b52be30cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5f92af8a2a53f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/87568678884.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/what_is_a_probability_distribution_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/jufojutonitidojom.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/tukebajiximotudipok.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/34263196463.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bavofomugujomis.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_off000086f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F0 4784 bytes
SHA-256: 5046b353c49423d22a791fa875aef2fc2f0ebc36d34e889e8043e9db9b00f435
font_01_sfnt_off00009740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9740 10728 bytes
SHA-256: f731a88bde80ea0a61e3c3a4feeffed710819a03cd2f639d007650014c181daa