Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dee3455a21a604…

MALICIOUS

PDF

51.4 KB Created: 2020-10-02 00:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 83b8c97c7aac1049217226d06d824193 SHA-1: a696c0239c077ce0f2f14b8f9d0718393e57aba7 SHA-256: b7dee3455a21a6041e6f44974669ead45095aac8148804449c5ba8dc66e4e37e
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=ravish+kumar+book+pdf+free In PDF document text
    • http://files.liveoakkids.org/uploads/1/3/0/9/130969154/c854d6de2.pdfIn PDF document text
    • http://files.faithstjoe.com/uploads/1/3/0/9/130969656/zudowar-xijomimafexeju-lanuluzojug-lokavu.pdfIn PDF document text
    • http://gubumo.hifacestudio.com/uploads/1/3/1/3/131379070/5308bf87055df8.pdfIn PDF document text
    • http://files.littlefallsmediation.com/uploads/1/3/0/8/130873786/farofe.pdfIn PDF document text
    • http://nulud.transformational-healings.com/uploads/1/3/1/4/131453096/sadejofa-netagonenelika.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/1/0483/5124/8544/files/wufipifukanoxatum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/california_substitute_teacher_covid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6189/8135/files/petivutiwelofasupulofor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/education_twitter_chats_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/the_wheels_of_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2993/7566/files/minority_report_important_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5752/8478/files/nazipamaxez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8481/1940/files/6.2_2.4_packet_tracer_configuring_trunks_instructions_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3071/9911/files/womenokavixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9772/2531/files/28413580232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/rikki_tikki_tavi_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/casmed_740_accessories.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_off00008a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A84 5520 bytes
SHA-256: ca9929400ef55b5967cf261de4e057c3c0cfd6ff6a3ebf4c9d4cc7a452f3cc0d
font_01_sfnt_off00009d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D24 10300 bytes
SHA-256: f2a997eb13c1fc5422904893e2fa91d8f73fd2d44def25f2d5bd504798b0de6b

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