Malicious PDF — malware analysis report

Static analysis result for SHA-256 357d61dcf8749adc…

MALICIOUS

PDF

50.9 KB Created: 2020-11-01 15:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 78d0120c5ebd2e9cdb387d924d70da55 SHA-1: 665ecc1ebe24a20f826a4ecf3861be0f2e113b4c SHA-256: 357d61dcf8749adc64a925c559ee0aea470c47ade88c75ffd7c2ee72ec6305b7
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.link/pify?keyword=how+do+domain+spells+work+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f88897ed6541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8fa4c187747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8a21e260d95.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/letekigu.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/wupafaboxelofil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f882e8e24bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f8906a337735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f99958317c3d.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/1/0496/0003/7027/files/85744371528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e8ce78-4e7d-4102-af20-fa777de151e7/49308770499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadb4cf9-0e15-4b34-8d11-f5c33835ac98/lanugakibove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2d7e03-663f-425d-8882-0fe142bcbb0c/fubolim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9c6051-a15c-45eb-ab70-0d60528ce7d4/bususafedexu.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_off000089df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DF 5348 bytes
SHA-256: 5d37ade0e041d9cf6ae4932b7479b577462de2bb733bb0438c575ccec9939772
font_01_sfnt_off00009c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C01 10332 bytes
SHA-256: c25dd1eff80d2683ef9cf5d61cd0371db2bf1bc8bd5ce00fdc293366e871d620