Malicious PDF — malware analysis report

Static analysis result for SHA-256 958c273d9a0511bb…

MALICIOUS

PDF

41.9 KB Created: 2020-10-06 16:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ecff8a9bb383e1cddd7f00b8a32f77ee SHA-1: b4e90ab033e661f725afe721df83c49d3d8fa382 SHA-256: 958c273d9a0511bbdc0329e8fc9545b13a2e8258db57c20aa53e767966a8e0d3
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://gettraff.ru/strik?keyword=tcl+55p607+55-+inch In PDF document text
    • http://zelozupu.serenitycottagelondonontariocanada.com/uploads/1/3/2/7/132740353/sifije-zawenuxesa-boboxoritage-kuwutijitaj.pdfIn PDF document text
    • http://files.the-syndicate-group.com/uploads/1/3/2/8/132815008/11f7e.pdfIn PDF document text
    • https://site-1039197.mozfiles.com/files/1039197/zibuvatilufokusi.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/70107018011.pdfIn PDF document text
    • https://site-1040042.mozfiles.com/files/1040042/66564130334.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/1/0481/5234/6777/files/living_with_the_himalayan_masters_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/fiber_content_chart_of_fruits_and_vegetables.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3839/8869/files/lasiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/82007174342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/leather_carving_tools_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1560/9761/files/area_code_720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0156/0226/files/mary_mack_song_words.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_off000066c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C7 5016 bytes
SHA-256: 1cda4b2666dadbe0f1233fb586f4567341091c999e94c0bfb659d043d6d7cfc2
font_01_sfnt_off000077f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F5 10260 bytes
SHA-256: 5599d1b0a705aac1626964b26c709bb2b470365daf0d7eaab9014e55dd83a5b9