Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa6cbef54fe0d7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 18:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 22175d5455ba5058d05116ae2965b649 SHA-1: 666180181d003a867e4d1688299059726245749b SHA-256: 41aa6cbef54fe0d7d3d1467f4dfa359b913f6fb7c5f09406edd03162dec8a764
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=%25D0%25B2%25D1%2580%25D0%25B5%25D0%25BC%25D1%258F+%25D0%25B8+%25D1%2581%25D1%2582%25D0%25B5%25D0%25BA%25D0%25BB%25D0%25BE+%25D0%25BD%25D0%25B0+%25D1%2581%25D1%2582%25D0%25B8%25D0%25BB%25D0%25B5 In PDF document text
    • http://gukaw.aquanautsoflivingston.co.uk/uploads/1/3/1/4/131453674/neligipijowopalis.pdfIn PDF document text
    • http://files.authorlia.com/uploads/1/3/2/7/132712096/9806036.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/1/0435/6761/2063/files/zeripak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/venivevunawem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/7783936973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/5172563351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9981/4040/files/atlas_de_microbiologia_veterinaria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/void_core_assault_rifle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/bujumudogidawoxufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6678/3899/files/broken_vessels_lead_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/saguv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/99678851216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/1281606359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/bevorusipuxulojij.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_off00005559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5559 5444 bytes
SHA-256: ff5d30e320a24b5fa2ee84963df6f1e734c03ca66be6ac7e30670b6b26549cc0
font_01_sfnt_off00006772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6772 14336 bytes
SHA-256: 7853ce650a46e5620973e2ff9fffcbccd4729ad343b81edb1e9d6f2f422b2349

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