Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0baef89207a95b…

MALICIOUS

PDF

46.8 KB Created: 2020-10-07 03:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3f7bd7560d9c8909c091c91444296571 SHA-1: 95755353af075934c1938704fb3e5953c390cebd SHA-256: ac0baef89207a95b30df19ea54cc42a579970ba3eed6eb3ef1fda70e7f7ac99c
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=gardner%2527s+art+through+the+ages+15th+edition+volume+2+pdf+free In PDF document text
    • https://site-1040278.mozfiles.com/files/1040278/77847563442.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/20294809415.pdfIn PDF document text
    • https://site-1037203.mozfiles.com/files/1037203/derufuve.pdfIn PDF document text
    • http://files.easygrammar.com/uploads/1/3/1/3/131379738/2671219.pdfIn PDF document text
    • http://files.srtsl.com/uploads/1/3/0/8/130814581/bumavuzodan.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/1/0433/5665/1669/files/cat_and_the_hat_poems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2372/9318/files/21260487184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2055/1845/files/91633210868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3642/9466/files/wisemanuwulonudixezij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8881/7562/files/70s_disco_mens_hairstyles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7669/7246/files/jilepaxajikidesafop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5557/9046/files/3m_maplewood_mn_building_224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8785/3720/files/76620750522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8356/5730/files/bobigoxajaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9083/7655/files/garekofimebiguvuzum.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_off00006a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5772 bytes
SHA-256: 10674e78320d614586b7744fae168e5c334229610e4e21c288c1f77d0690fe0b
font_01_sfnt_off00007da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA2 9880 bytes
SHA-256: 9ee187b7edf604bb72b692c1187b2bee665e5bef61549cfa37fd679501faafa8
font_02_sfnt_off00009f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F62 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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