Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce6dffd606b6418…

MALICIOUS

PDF

46.2 KB Created: 2020-10-02 12:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 491ac81c28dcbf2cc0444219b6d5ea73 SHA-1: dcbbfbccc22eb2a020d34d4fdb393b0bf7f2a1e1 SHA-256: 8ce6dffd606b641852c1c23f4e6c47a1092a9de3a8e9127d398d866fa0bc2c78
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ggtraff.ru/strik?keyword=augmented+reality+ppt+2018 In PDF document text
    • http://gamupezim.showmenicaragua.com/uploads/1/3/1/4/131437918/f8c2e.pdfIn PDF document text
    • http://fiwedafu.shopkoco.com/uploads/1/3/2/6/132695424/6069504.pdfIn PDF document text
    • http://files.nickynoodlesdoodles.co.uk/uploads/1/3/0/7/130775830/laxemixugazisupole.pdfIn PDF document text
    • http://zovir.henryssports.com/uploads/1/3/1/3/131379554/girux.pdfIn PDF document text
    • http://files.coalitionpoliticsandeconomicdevelopment.com/uploads/1/3/2/6/132681690/xijupiguve.pdfIn PDF document text
    • http://files.rabbitstonedesigns.com/uploads/1/3/1/3/131381240/xuruj_tesesugokezik.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/1/0437/1791/8875/files/marker_interface_java_annotation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/jirumedidusawij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5986/6521/files/73667861632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2130/6526/files/dfo_female_launcher_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8233/7444/files/commonlit_ancient_greece_answers.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_off00007502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 5712 bytes
SHA-256: 54373830fa667e4c53c1bdb92fa476b3a100e7fb9d3d739e3aa7ddfc83281201
font_01_sfnt_off00008868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8868 10388 bytes
SHA-256: 37916214cbeec294f498929d7dc72759017dc0b1452503c70572682d3bde7888