Malicious PDF — malware analysis report

Static analysis result for SHA-256 6644fd64c9e24279…

MALICIOUS

PDF

53.2 KB Created: 2020-10-02 06:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 01679481725409eb3974993f235cacba SHA-1: 1bb4f009c0b22d7aa3be05f68f0d868ed8406fb6 SHA-256: 6644fd64c9e242795702e929feb243421da5b759607043041a8c556aeb5e83ed
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://cctraff.ru/strik?keyword=absolute+value+inequality+word+problems+worksheet+pdf In PDF document text
    • http://pezada.robinsonelmwood.com/uploads/1/3/2/6/132680949/a42f780866.pdfIn PDF document text
    • http://files.20thcenturyracing.com/uploads/1/3/0/7/130776141/vizidok.pdfIn PDF document text
    • http://wuvad.samhoustonbap.org/uploads/1/3/1/3/131383721/tabilanivute.pdfIn PDF document text
    • http://files.juliathegraphicdesigner.com/uploads/1/3/1/4/131438539/pokigovu.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/87348488135.pdfIn PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/xatodo.pdfIn PDF document text
    • https://site-1038422.mozfiles.com/files/1038422/gukumeno.pdfIn PDF document text
    • https://site-1038660.mozfiles.com/files/1038660/wisarisowobimomef.pdfIn PDF document text
    • https://site-1036871.mozfiles.com/files/1036871/giwixigo.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/34909961508.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/1/0434/0059/3557/files/samsung_ice_maker_not_working_after_reset.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/luvigamopuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1353/2571/files/annette_alvarez-peters_retirement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9561/6407/files/29545076640.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_off0000884e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884E 5852 bytes
SHA-256: 207d182a31aa6276758c04cbdf09bd2ce1eb7ad31113cfe917c7e366f29fbac2
font_01_sfnt_off00009c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C28 13412 bytes
SHA-256: b41369c594576d1c4d392db11013e0cedab372abc358b2ea504872a0d0514446