Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6509912aa57884…

MALICIOUS

PDF

40.3 KB Created: 2020-10-16 08:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d06a9f51b86831d08546b65628f8072a SHA-1: a9cb0e1ca12d15caa58fe930288a03e5434d7e70 SHA-256: 7a6509912aa578843fa9ea00ce3e5a91f5717979c8b4f62676fbb0a477ab5200
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://gettraff.ru/123?keyword=persuasive+writing+techniques+ks2+pdf In PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/4357605.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/vixezuxapa-texewenagig-dewuxukazavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f87ef875e568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f890e2504e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f8898f829875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f87beb206f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f86fa4b7d669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f87620b944b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f871a5624e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f87085268f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f87cfb08ce60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f87c3b0522c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f87129464af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8715378144f.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/17216e90-2a0a-481f-8af4-f64d79d7037e/gaputizalitufajexinumeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a584413c-d18a-48ae-bcf0-4928250a0872/28941844046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a9e55b-6fe9-4548-a2c8-2b5d629ae0ae/kixew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91531c44-5da5-4375-868a-11ccf779efb7/92084529368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122fd076-f38e-46f2-9254-5f159475ae7e/61455464236.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_off00005d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 5860 bytes
SHA-256: 959a13fc13a3c8c32398c47c3b9efe6410acab1851dbaded928ef1c2a5a061b6
font_01_sfnt_off00007111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7111 10120 bytes
SHA-256: f14f52d29427358594b29347d98847901ecd305699a86160af68cb932ea8f8fe

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