Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d9d788cd1b923d…

MALICIOUS

PDF

48.0 KB Created: 2020-10-07 23:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: c6023392b435ba708718e11cef1f9616 SHA-1: 5d36ae40628d47a70db7ef01b5c85a89a2a53f65 SHA-256: 70d9d788cd1b923d92cc26193c7ebd647e980f0f48dd8d949808dbf6a321bb3e
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=seiken+densetsu+3+guide In PDF document text
    • http://kabof.ilandwyte.com/uploads/1/3/0/8/130814328/7b7ea16a.pdfIn PDF document text
    • http://files.janebliz.com/uploads/1/3/1/1/131164519/wumena.pdfIn PDF document text
    • http://tivarilon.realityisoptional.com/uploads/1/3/1/6/131637432/rubati.pdfIn PDF document text
    • https://site-1043876.mozfiles.com/files/1043876/30044923557.pdfIn PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/64813139373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d89767-afbf-4667-ad6d-7d6d7011f92b/74729389685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/med_tech_test_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/lonely_planet_india_vk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/52206234110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3938/2430/files/if_beale_street_could_talk_full_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/4376079127.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_off00007e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E77 4984 bytes
SHA-256: be6b21009bc31f08f9aae8e8522df77e0d4708ba61bf4ef3ce7d006677d744a3
font_01_sfnt_off00008f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 10420 bytes
SHA-256: e537e9bd1b0a30c8e2427b07a95fce9fd7355e7f2119da7760932a6c6274200b