Malicious PDF — malware analysis report

Static analysis result for SHA-256 5760b357a0fbbb05…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 915259e118ffd30f6efd25aba38516e1 SHA-1: 2cbb1f065771007542052688a411bb43beba0ad5 SHA-256: 5760b357a0fbbb054a9292bd37e36c490a42934013cd61c2ea025563cfabade2
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.com/pify?keyword=adverb+clause+exercises+pdf In PDF document text
    • http://files.oundlehockeyclub.com/uploads/1/3/2/7/132710763/1c5e2994f1b73e7.pdfIn PDF document text
    • http://files.blboutdoors.com/uploads/1/3/1/6/131636969/wutaveluxorunulenap.pdfIn PDF document text
    • http://files.paulmcphater.com/uploads/1/3/1/8/131872087/simopupipufuri-mizub-voges-fijabolanabojo.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/1/0430/0167/5939/files/statistical_modeling_a_fresh_approach_second_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/nutuvokowiluj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/7170816975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1723/9704/files/bash_rename_directory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/puzafoxulokedidomenapok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18410569865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/bubemupibob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2870/9539/files/78412641178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6145/8597/files/xedare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1276/3298/files/continents_of_the_world_and_their_countries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/sebegefijugopigefafozapef.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_off000065df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5404 bytes
SHA-256: cca61458be4c8277fda0ed55e3945455bf4c274a03ef9a591efa2d8e9deb0ef9
font_01_sfnt_off00007851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7851 10120 bytes
SHA-256: 42c8a7e472c09929eb5cfe888044655faf2965fd6ec2da4ce18e4f4001fb7424

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