Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a5c94e491de2b8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 20:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c6c35ff5fa713cd3aca1dee531d34cea SHA-1: 66cc9d767ec51e0d41f1566e3890273a1260a91f SHA-256: 28a5c94e491de2b8481e05d3e6a7badf34c11c5d4047a17fc304d33935e44ea4
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=case+study+of+a+child+pdf+in+english In PDF document text
    • http://files.sagharborflorist.net/uploads/1/3/0/9/130969731/tafufirivisazobujeg.pdfIn PDF document text
    • http://files.taniajanenaturally.com/uploads/1/3/1/4/131454373/lipikudura.pdfIn PDF document text
    • http://files.guitarhympia.com/uploads/1/3/0/7/130739777/bipazovulabebu-zesexonuxemav.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/1/0437/4292/0869/files/chemistry_and_chemical_reactivity_8th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/simuwinog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/koxiwowafaxanejuzenowav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/3963476029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/44414621912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7251/0362/files/zopisetunotogalomoveje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/46253760435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/veleluvepeba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/dejap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0528/files/44709265668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4607/5554/files/vexikodujit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/93661591503.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_off00006e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E02 5328 bytes
SHA-256: a30ab97707bf372ffd605ba257904ce53cc0da0aefdd3c1905f6a312d7e868c2
font_01_sfnt_off0000802e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802E 10012 bytes
SHA-256: 93b5ca304dcea82b79d98ce005df90b3cf04d65be31b459ab235155f6cde4cc1

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