Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e24c05fb9d4512…

MALICIOUS

PDF

36.6 KB Created: 2020-11-06 04:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 848b19dfc8ba86321424320a57372875 SHA-1: 871d908f039f8a941b016eccbb16884b6c4be5c7 SHA-256: b3e24c05fb9d4512b6061efb05dd654ab52f8f1f0f791e18b6c236e3d84a8d9f
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://traffine.ru/123?keyword=board+feet+worksheet+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5f93455bb1da0.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/1127167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f9739ed08af5.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874eb1b3d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5f96bc5d42745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e668b1-604d-4ce3-9583-90063bab561a/22564917906.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tukijizolusokaletubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847f96f1-ae3b-44f0-ac5d-a58a41ce3d78/tanewime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79e003e-5936-4924-b0ab-ed314547571f/58208425626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bdcf87-28a4-4387-840c-d11290fce4c9/nothic_5e_stat_block.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2815/9396/files/95933649355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c39f7f-d0f8-40f5-bb5a-af7c8a7df980/dabibitaxaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/fibipifukenowenowu.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_off00004f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F64 5220 bytes
SHA-256: 3063f9111fc0ecc04094ec173c32d3010a8626268aba9e7908c1364a4388b008
font_01_sfnt_off0000613e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613E 10732 bytes
SHA-256: b19d71295bc82b24f7e9b543960a6598875535a822f4c86f26173329a956bd5c

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