Malicious PDF — malware analysis report

Static analysis result for SHA-256 7044c1108371c494…

MALICIOUS

PDF

38.5 KB Created: 2020-11-06 16:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0922e52f03889b68a2fa40115699a6cb SHA-1: 2e6fb0cc33b763843f186ff7c044e640bfa6d7d3 SHA-256: 7044c1108371c4941aa38cd136b446bc2671b45270065b6a17c17ce9d01a89fc
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a high-confidence ML classification for maliciousness and features a heuristic indicating an SEO redirector link, likely for phishing or malware distribution. The embedded URL 'https://trafffe.ru/aws?keyword=words+start+phi' is directly associated with this malicious behavior. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=words+start+phi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f8bd209e8260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5f927d22bc1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8af44b361e2.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f96bff87b7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f906514424d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f96009fb4d23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://virinumit.files.wordpress.com/2020/11/63640468683.pdfIn PDF document text
    • https://zomotinofi.files.wordpress.com/2020/11/88680988383.pdfIn PDF document text
    • https://bebezabezite.files.wordpress.com/2020/11/guxeresuniwi.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/constitution_usa_a_more_perfect_union_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/28953412266.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/john_deere_757_bagger_parts.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.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_off00005834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5834 5028 bytes
SHA-256: c6bbf59438849033561373001bdec4737e12339eea35eb6c672cd72e5b62375e
font_01_sfnt_off00006954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6954 10688 bytes
SHA-256: 34afbfd0352477120ad50610512fa135e672f335d9ecaedddeb8912a64cd9463