Malicious PDF — malware analysis report

Static analysis result for SHA-256 15851d69c7a29f6c…

MALICIOUS

PDF

44.7 KB Created: 2020-10-31 16:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: bc557e581cf36343bb9ca878b6950445 SHA-1: 2918fb334014402d969679e41500fb0b7e74e59d SHA-256: 15851d69c7a29f6cc52a96d208e92f955208da5afff04acdae3fa39589ca1c92
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.cc/pify?keyword=mr+comet+living+environment+laboratory+manual+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8e15dfcb65c.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/f68c0c51-21ee-4233-a0c0-60352c1afc88/punoguwajewijinomubafox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/31465557322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7e067a-38f6-4e1c-95a3-744d7f0ba0b9/vapumalipabiwodixog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2735/1717/files/network_theory_tutorialspoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585abbc9-39fa-40c5-b4d4-86874356cfe9/15373338077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370831ed-6acc-4076-8a83-c9251e19dc2d/govexeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b9071b-257b-44ca-b198-98e9b7f83868/dozuwifepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54d9fd7-f82e-4d48-87a0-380260c133a4/vuverevesejotupop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82967116-5217-4367-9b3a-db100d75e46e/tokobubomuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d475d67-220b-4468-b1fe-de23b65282e9/caramel_craze_iced_latte_dunkin_donuts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbe7214-ed60-4b31-b804-54da4ddf62a7/el_buscador_jorge_bucay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3582595-b305-43e6-96b1-ae87df960224/15208507626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a897d172-a2ca-4e12-806b-62b35a6874fe/shop_vac_6_gallon_3.5_hp_review.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_off00006d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5516 bytes
SHA-256: 802e28babfd4b0c5757f650c88fcec32f538cd831448c2ed4dd6c3cdb00ff937
font_01_sfnt_off00007fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEC 11472 bytes
SHA-256: c067ded379dce424d41915ba523a14bfbb8de5266bc4e70885112194fbcccdaa

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