Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dbe402abbd69a2…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 08:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 33a820475d23be4c4772639ce8295b0a SHA-1: 7e62087faa9637660cc34d02eb65013993e80fbd SHA-256: 40dbe402abbd69a239d5cf557bd1faad5e920adc85d3f9406a274af2ddea693f
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.ru/pify?keyword=animal+farm+major+themes+pdf In PDF document text
    • http://files.lacrl.org/uploads/1/3/1/3/131384081/fajume.pdfIn PDF document text
    • http://lowakolug.stviatorparish.org/uploads/1/3/1/4/131452883/sadijetexu.pdfIn PDF document text
    • http://files.thelocal-helena.com/uploads/1/3/2/6/132682919/dukokofija.pdfIn PDF document text
    • http://files.yizhixu.com/uploads/1/3/2/8/132813998/ba465a021b0.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/1/0436/8062/8889/files/java_data_structures_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/denisotomezodikoduto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/contaminacion_ambiental_ensayo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/zibanuburilukulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/423147044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokadexowigexavutezirero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/balancing_chemical_equations_pogil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/12994240290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/reguvibatofodusiboli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34515707504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/48583161758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/ruzovenokefetator.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_off00006cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC9 5348 bytes
SHA-256: 8cfab6f8799dc447ef0c0727b84b7d5565dff2339c9d5a2217db5d9b3b59e072
font_01_sfnt_off00007ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECD 10412 bytes
SHA-256: dda911ff91935bdadbf892153de7163b81f55e9a98d9b7936edbce30af4330bf

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