Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e70abcd434b62…

MALICIOUS

PDF

45.7 KB Created: 2020-10-02 13:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f4ed7547b56d0087875546fa8053056d SHA-1: 522e01fa582bc79cff41118cb1ff07458354c713 SHA-256: 1b5e70abcd434b6206a65bd8dbefab8430c998f64fa5d8ab1496077a8f28eb0b
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=megalodon+vs+mosasaurus In PDF document text
    • http://files.kimtarrestaurant.com/uploads/1/3/0/7/130776592/85648508a87a23.pdfIn PDF document text
    • http://juburuwe.floodsaxsingapore.com/uploads/1/3/1/3/131383483/kugubol.pdfIn PDF document text
    • http://files.youngeyephotography.com/uploads/1/3/1/8/131872269/wijunebi.pdfIn PDF document text
    • http://files.chardehenderson.com/uploads/1/3/1/0/131070366/8792782.pdfIn PDF document text
    • http://kefaxanu.nurseryschoolofumc.com/uploads/1/3/0/9/130969027/9ba73bff07e75e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8443/7922/files/77841627667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5190/4924/files/wells_fargo_atm_myrtle_beach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1832/4632/files/72852741815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/ultimate_echo_echo_abilities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/minecraft_small_treehouse_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/krik_krak_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1231/2221/files/jodi_arias_married_in_jail.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8825/3606/files/apex_health_course_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/3.2_linear_programming_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7590/3392/files/4_pack_abs_male.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000696a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x696A 4964 bytes
SHA-256: cca13983359055d56749c67e4d7a7d4fa6ed60e741570c45b257142b40ac2c81
font_01_sfnt_off00007a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A35 9812 bytes
SHA-256: 80dfc03ccc61f78dfc2ab15a5f8d65d80aa3aed919730348a6373857304fe8aa
font_02_sfnt_off00009bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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