Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17529c1bb1d66fb…

MALICIOUS

PDF

46.9 KB Created: 2020-10-07 01:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eb87eda95f090c577eb0a6b6ad14034c SHA-1: 7d3d625ed2ef3544bfc5eaf908ccbf0a1ef1c0f8 SHA-256: c17529c1bb1d66fb60a8a27b8c879c6b4475383048fe995235016a3e82440161
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://gettraff.ru/strik?keyword=the+weeknd+starboy+download+mp3+free In PDF document text
    • http://mufegi.kenmeyerjr.com/uploads/1/3/0/7/130776031/mofovezutukab.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/kufabofalates.pdfIn PDF document text
    • https://site-1039356.mozfiles.com/files/1039356/42171187077.pdfIn PDF document text
    • https://site-1038963.mozfiles.com/files/1038963/gajevefawuwesawawo.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/75bfca70-28bd-4eb4-a7cf-ef265439c210/5217285452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abc7a79-cc65-4b84-a499-70a65fd51140/sazalavomiwelanexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d956d56a-dbdb-4126-a6e5-8a930bb2da1a/12968506940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555978a8-d442-4766-8c7a-203e823e8c08/28248498773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6164/3930/files/76616221860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/ieee_802.11_b_standard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/attack_on_titan_jacket_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7253/5707/files/57246189412.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44F4 2920 bytes
SHA-256: d9bdba14ddaa77c44d034e5a47b509aed864793376ac5cd26463af23332af661
font_01_sfnt_off00004f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F58 5792 bytes
SHA-256: 57a6c6431b5f0254c1823e7c5ee905b221074c1148874b508c0de41ca16357e5
font_02_sfnt_off000062f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 14176 bytes
SHA-256: 1a1517122dd06b03e3de872126f5e5f7956919bdde31a13db9083cb04d45ebd2
font_03_sfnt_off00008ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA5 18776 bytes
SHA-256: e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed

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