Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f14218491f37fd…

MALICIOUS

PDF

41.1 KB Created: 2020-11-03 09:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 3aee8280c09f8954019f2adab010f5d8 SHA-1: 9d0d709dc7d4a2b21dac93eaa4b19149fddbbc23 SHA-256: 16f14218491f37fd9b233ae2a262ec1746e4aad5132d76f39695072ed543c30c
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/aws?keyword=download+optimum+app+for+kindle+fire+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f926209208cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fa0dbead1539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5f8af9593b3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f89629824a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f8fc975d1699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f899b287dbc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5f95d8ef35c61.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000619e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000619e.bin)
    • https://cdn.shopify.com/s/files/1/0497/9739/8689/files/technical_drawing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4748d5cb-fb15-4d07-b96c-707e613018e3/fatoguluwenagubopilapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d1cf66-523a-4380-a68e-43bbebf763e6/arquitectura_interna_y_externa_de_un_plc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/6634197642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467ee7ff-98ad-4693-b776-6e514abfe76a/64900724723.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_off0000619e.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000619e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619E 5356 bytes
SHA-256: f67ab032f6874eec5cb54c9cadac9e28abe4f0b8062eb2f77e672f1d003fd718
font_01_sfnt_off000073e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E2 10536 bytes
SHA-256: db0acea6aec0fff53129cb2905f9d9483442a16a7841843c57e49a7108e612bf