Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85c7b27763b2cc4…

MALICIOUS

PDF

44.2 KB Created: 2020-07-23 13:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: ac4c550f86ce43cc56e01e2a201026b3 SHA-1: 535ae23fa8d70cc31b594817394739dd9dc37257 SHA-256: c85c7b27763b2cc4a8ae8ce96000de5f363af30caa59c7059b4ba127d905eabf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary lure appears to be a search result for "micropaleontology textbook pdf", directing users to a malicious URL. The file also exhibits characteristics of a link farm, likely for SEO poisoning to drive traffic to malicious sites.

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.ru/wb?keyword=micropaleontology%20textbook%20pdf In PDF document text
    • http://files.patchsprint.com/uploads/1/3/1/3/131379343/8edc7d6f9.pdfIn PDF document text
    • http://files.mwpgs.net/uploads/1/3/2/6/132681660/9a7969582dafd7.pdfIn PDF document text
    • http://files.capetowndaytours.net/uploads/1/3/0/8/130874629/bugob-bowon-jozopo-vudux.pdfIn PDF document text
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdfIn PDF document text
    • http://files.electricianlivingston.org/uploads/1/3/0/7/130775968/jorixoxipejowefapi.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/1/0432/8184/2341/files/podivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/32047900474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/bewosogopewanajadometotis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/11931932776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/97079043805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/48268713949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/ponibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/47125755779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/26554584143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/pujapukapitav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/91293465164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/xogajubalikujo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7226 5312 bytes
SHA-256: cf7c4efc4522a7a74a682104cf8e73375427d3d08cc7dd5c0187380a8e00ba79
font_01_sfnt_off0000844d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844D 9268 bytes
SHA-256: 883ffabd53f4d08441fded9d5baf37268d8a943c222d20c67b38c196a92bb616

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