Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8739e0ad766e5ee…

MALICIOUS

PDF

42.0 KB Created: 2020-09-30 06:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6ab3f91be91f97a3662d3d0e1248509e SHA-1: e84e1689edfc6440908c7c55ccb900e458fc7bb2 SHA-256: c8739e0ad766e5ee57752aea1cb866fcbbc87af39c6b0fc8a48844a2422f616a
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://gettraff.ru/strik?keyword=psychology+quotes+about+the+mind+pdf In PDF document text
    • http://files.serenitynowalpacas.com/uploads/1/3/2/6/132696285/ff9e1782dd.pdfIn PDF document text
    • http://files.cheersatthepier.com/uploads/1/3/0/7/130775261/tirulurap.pdfIn PDF document text
    • http://bubaf.higgins-sinus.com/uploads/1/3/1/4/131482975/xinefijagatu_gobadodulivite_femavuvosan.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/basuk.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/10483801796.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/1/0435/3110/8503/files/bohemian_rhapsody_piano_sheet_music_with_letters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2206/0200/files/15818177597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/7512704296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/64943162806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0534/7493/files/global_entry_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/manual_kia_cerato_2010_portugues.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3218/6532/files/13409018981.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_off00006424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 5840 bytes
SHA-256: 6a82eed578313938d2ad020db04ac5d40c2ca9be0a06fdd114af9a446b597b13
font_01_sfnt_off000077e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 10500 bytes
SHA-256: 20c89a4f7556cc746d1175598b52e9c945b2da004898ee1ed0fc7c9d2d8a5063