Malicious PDF — malware analysis report

Static analysis result for SHA-256 231fc2dbd2ff0704…

MALICIOUS

PDF

50.1 KB Created: 2020-10-16 14:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 906428f29180708eaf49bc802edf2a5e SHA-1: ab7360917abe7ef04020d999e717b3c5dc599644 SHA-256: 231fc2dbd2ff0704c0e01d2f6addfef346f8c55782da1d0bfb6082e1ccb6238a
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/strik?keyword=senderos+fronterizos+resumen In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f885995ad1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f87019f5a819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87e99fb1cd3.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/fizonefovuladiluroba.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/4fdcd020a6a14.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7941/0867/files/hacking_simulator_hack_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6719/5040/files/process_audit_checklist_iatf_16949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4447/3498/files/descargar_musica_gratis_para_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/4022348439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2782/3264/files/47595728517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8896/4503/files/wafalubatededomutif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/tracking_deer_signs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/50790238636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1128/2840/files/what_is_fun_googley_swag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/0877/0467/files/72381989038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6571/1013/files/41276633258.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_off000085cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 4964 bytes
SHA-256: f679aaee25cba39425a0fd51dc1c9b8baead92dbb7a78f29de251a0085e70ef2
font_01_sfnt_off0000969b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x969B 10344 bytes
SHA-256: 9dc7e0d14ec6c117b6b0a7e6b789fa425d528047e9118fdde89cdb90b35034df

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