Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc667ca92c1f8c3c…

MALICIOUS

PDF

38.8 KB Created: 2020-11-04 01:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: ad3273797cb79ef371f535e137c9a4d6 SHA-1: 2109f4bb3c130cda6cb4620d3711e5fe65082e55 SHA-256: bc667ca92c1f8c3ca975b86508c6620f02edbb837db3bc861cfbe49303efdbdc
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=walle+dystopian+worksheet In PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/bef2c9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5f9c276520f3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/uggs_coupons_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/46551542575.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/2839324963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4907/1790/files/ravupufekiwikekerem.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/kovuwiwitikumufidexawa.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/nezufozo.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/91068484569.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/formal_approaches_to_management_development_in_organisations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8755/3213/files/costco_cake_order_form_staten_island.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/12437541338.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_off000057d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57D1 5320 bytes
SHA-256: 326fd30ebd37b7695427c7334729bebf548bc8cfacbed94a9e24245797dc7d1e
font_01_sfnt_off000069fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FE 11096 bytes
SHA-256: d6466ec622430d0bf9ddafe8533d8edba41aa1b43bd80718cfe4b5941e8c3ac0

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