Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a2e413872cad61…

MALICIOUS

PDF

47.5 KB Created: 2020-10-26 04:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 5a81e8062249905bb7376624b274396b SHA-1: 3f543728461fb55c45afba4f20a0214969a006c4 SHA-256: 21a2e413872cad61424480e4b17d00a1a54a01c5f261df95509548ebad17197c
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://ttraff.me/123?keyword=william+butler+yeats+the+second+coming+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5f8d9dc7b7e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f9061e93f538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f870207cb6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5f9623aa232ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f877f45b0958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f91aed4b4105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5f948926c9e0f.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/1/0495/7519/8876/files/virumunutudufasipinen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7358/4289/files/menedafef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6763/7411/files/fosekiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195c213c-5136-47d7-91a7-0ca8ff53efb0/83584348666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88486dd-7d90-4d05-a8ff-95a2bddc70cc/gta_san_andreas_hulk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b0e372-496c-4ad0-aa00-70454d740ccb/tidavopolodiwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8c0b3b-19d4-4208-a45d-6d8fd135eae4/71533622294.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/braveheart_full_score.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/acog_guidelines_postpartum_hemorrhage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/skype_apk_download_for_laptop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3427/2159/files/fundamentals_of_bacterial_plant_pathology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/7th_grade_math_geomentry_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0020/7777/files/wonevakoge.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_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 5824 bytes
SHA-256: f81e8ed26e9d928cb9b45479b75fdf959a4ee53e21aaeef02a204d7253a99b49
font_01_sfnt_off00008d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D81 10236 bytes
SHA-256: e070434982dcd71a071001253a26d922d87e0b1bd73581354ca2614ccda9b851