Malicious PDF — malware analysis report

Static analysis result for SHA-256 3551b207c42d8758…

MALICIOUS

PDF

38.0 KB Created: 2020-11-08 01:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 51c26c303b87ed79622c4270e860bead SHA-1: 815d4cd4b2d509682b013129023570ad4db16bb1 SHA-256: 3551b207c42d87580bfe5f0e45f62584f8aa84ed6f8934d9c3b83759aef5587e
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://traffmen.ru/123?keyword=unblocked+games+66+sprinter+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f8fee64b2a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5f9eddebea342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f9799a170783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_5fa5bfd0d533b.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/eee59469-2ce4-4e9c-bd90-f0d85e28adb3/32085177997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce81146-ae6c-46b6-85e6-1690beb75991/10_second_challenge_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9574faa-2676-4a0b-a0b4-81375054f643/mimar_sinan_slayt.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/22673499174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18eeefd7-1177-47dc-a8f2-ea9f78a191d1/sudomesiviwoxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b48b84-44a2-4ea6-ad1a-102969f70237/162871996.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/82057824648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b495f7bb-6816-4b65-95dc-2ef076a72b1e/7219260891.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_off0000541c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541C 5744 bytes
SHA-256: 184194b234bfb6497ac5d98310d8e577ad670268fcf3e756623b30f3ec1df404
font_01_sfnt_off00006787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6787 10004 bytes
SHA-256: fa95dd9bd6b8ee21280614a47da6e0f3f76a847a6af89846843e29d023e359b5