Malicious PDF — malware analysis report

Static analysis result for SHA-256 592cc39c8f22bf8b…

MALICIOUS

PDF

41.0 KB Created: 2020-10-29 22:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: bc4f8a463579993471b571c8fd16210f SHA-1: e60ba119b88d8c514152b6cc26869da947fae7b8 SHA-256: 592cc39c8f22bf8b3b9f804d211a456f21a0f4535b63899248cc5bda842e6ef5
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/123?keyword=stamford+public+schools+calendar+2021 In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/milawo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6783/2995/files/5088266188.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/parimejulupaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a4420b-ed13-411b-a96a-f97c113e0aed/luvevozego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7093/9842/files/hazrat_suleman_story_in_urdu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8311/8777/files/kedadimanena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6280/8742/files/euthanasia_judgement_supreme_court.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/how_to_convert_to_word_using_nitro_pro_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c988519f-9cf4-45a3-9ac0-fab980c52203/vozulo.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/kibuviwiwotigujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2371/0402/files/bugupelisujivodana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5037 5844 bytes
SHA-256: a3e82aa0088e7b7602f905c13a30cb8269f72d37ab7b1c2ff94b79f05e9ac19a
font_01_sfnt_off000063e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 11456 bytes
SHA-256: 846f5facfab82c44e8e2bd94f890649f2db477291b795244a210452222ff01fe
font_02_sfnt_off00008933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8933 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f