Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b610126d642ade…

MALICIOUS

PDF

40.4 KB Created: 2020-10-10 20:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b857dfa235016185e334f8c6ded77e8d SHA-1: 5ced4d7611700af1498422a313a14049d62e6530 SHA-256: 50b610126d642ade4fc0290a45664b9f363e2316a9f9ab26f87263c6c7ccd55c
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=two+way+frequency+tables+worksheet In PDF document text
    • http://wujob.msbui.com/uploads/1/3/1/4/131453416/481757.pdfIn PDF document text
    • http://files.kelarts.com/uploads/1/3/2/7/132740445/mozopakelusemu.pdfIn PDF document text
    • http://baratexup.vanessalabranche.com/uploads/1/3/1/4/131437778/d4d92bd.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/vubagusezutugonobuluz.pdfIn PDF document text
    • https://site-1041210.mozfiles.com/files/1041210/suzatomakusumesaturenoro.pdfIn PDF document text
    • https://site-1043798.mozfiles.com/files/1043798/gavutijitumuzuwinedusepi.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/22726788170.pdfIn PDF document text
    • https://site-1038776.mozfiles.com/files/1038776/46444322638.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/1/0479/6855/1068/files/15503054615.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4410/5111/files/dikemaxunebefugulazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/pulimonasopapewewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/42245958380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/89529481758.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3008/8342/files/black_desert_online_ninja_awakening_guide.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_off00006064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 5444 bytes
SHA-256: 2234506a3f75fc2571817e2b330443e08622ad285b6b3f56b44169a951624280
font_01_sfnt_off000072ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 9768 bytes
SHA-256: 835da90279f41ed21b631801374410db2b7baa25c6d6c07f215becafb2d032c7