Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd275f565c841be9…

MALICIOUS

PDF

43.8 KB Created: 2020-10-28 01:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 188d2e92103ef3bd4ff797b6d023e72c SHA-1: ec9a67e57199b4a00298262ae2702ecb2b87e034 SHA-256: fd275f565c841be966392136593629ec2bd5a9c6a6f5edb50edd1abf877362a4
202 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=minecraft+wither+storm+mod+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_5f964fd202b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f87b875a9bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f952be8446d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f8ce33b86ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f93c16746e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8bff1814ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f8925b7b9214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f874df1d503a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f98a598326c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f91b64aa626c.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005efe.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005efe.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off000093d7.bin)
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/compound_sentence_worksheet_for_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5386/6919/files/lds_housing_boise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/kenmore_refrigerator_ice_maker_replacement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1837/8152/files/purowexibanik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3851/4586/files/english_handbook_and_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/lincolns_reconstruction_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddd950c-0968-48cf-b4f7-534790b918ae/39977822989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0b46fe-c9ef-473a-bb28-005258ba1371/84135204726.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 extracted file (font_00_sfnt_off00005efe.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5148 bytes
SHA-256: a8916c8b1e89280e3328f19fb207a3abb2f9675e30c2b2640ab78d16e79eda71
font_01_sfnt_off00007056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 10408 bytes
SHA-256: 09152c5685f7b63e3dbee98de67b8627269b31f4d0010c8354b048eb599744ca
font_02_sfnt_off000093d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3