Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e772af671085bf…

MALICIOUS

PDF

40.8 KB Created: 2020-10-30 01:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: b399ffdb46cc136f3078c765c512fc21 SHA-1: 6c2e7b71645b6558d9a97682dcbd273e7ce5e7c0 SHA-256: a9e772af671085bf75ca9ab280823ab4a6199e002e9b05d72856082395b4aa2c
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/aws?keyword=summertime+saga+june+guide In PDF document text
    • https://medefanitinov.weebly.com/uploads/1/3/4/3/134386417/b13673da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f9279ef3dbb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8bf153cd3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f8a93d608158.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005f6d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005f6d.bin)
    • https://s3.amazonaws.com/zirojopemup/50159743836.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/6th_pay_commission_wb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7060/5462/files/noluxugenugijifepelazina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d54b1e-ad0a-4bcc-86ca-f956feffccdc/exerccios_did_didnt.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/fox_finance_associate_login.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 extracted file (font_00_sfnt_off00005f6d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 5292 bytes
SHA-256: 5e61cdedca9f376f15ec047f26ced1a542639e07104a4489b5d198001abde4c6
font_01_sfnt_off00007151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7151 11068 bytes
SHA-256: d8abc8a768a8489bda5919898719ac20f81df83638086ce41ff977773d6bb808