Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c515be389de7f…

MALICIOUS

PDF

41.4 KB Created: 2020-10-12 10:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1a8c4637782f1165db75903cd8460e42 SHA-1: 40a3555a19d78db96f50a7ee7eb453cca9726402 SHA-256: 1b8c515be389de7f0ec439b07ee6ccd62babeaaf121fd71c2c8d6cfb5c5c1854
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=d3+caldesann+s+despair+guide In PDF document text
    • https://site-1038401.mozfiles.com/files/1038401/tirugolikezuboro.pdfIn PDF document text
    • https://site-1041395.mozfiles.com/files/1041395/257385440.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/76273878838.pdfIn PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/75963540712.pdfIn PDF document text
    • https://site-1043053.mozfiles.com/files/1043053/bozopufarafukeneweraz.pdfIn PDF document text
    • http://files.vegetableway.com/uploads/1/3/0/9/130969489/0c68b76b2592.pdfIn PDF document text
    • http://files.marisamartinezmarquez.com/uploads/1/3/0/8/130874540/f9817590b42.pdfIn PDF document text
    • http://files.ladiesinpigs.co.uk/uploads/1/3/1/6/131636727/xanokor.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/1/0432/0546/0125/files/gatifinuwuzasemokixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/ranik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3632/2203/files/muvumujexin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2016/0671/files/moodle_ins_palleja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8069/1101/files/kanjani8_chronicle_haruka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0117c4e0-9065-4b91-b2f8-cfb8a364abcf/17819778260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79438d4d-a754-41b3-930e-bb8b6abd1946/15633497691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82df564b-42f8-46e9-88ef-aa19f8a822b0/4287945958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b97dc78-1e7c-4d78-8e80-af9913878593/69818615170.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_off00006308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5404 bytes
SHA-256: 3b6d9f882f50b9131b6e8a5bb2078c338a319116d9761f8a8fceb38696ac622d
font_01_sfnt_off00007568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10352 bytes
SHA-256: dd9579f94aa500f6f7ce569ed32a652979298531c970b54b35843bc32304fec8

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