Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b557571e4a776e…

MALICIOUS

PDF

35.4 KB Created: 2020-11-02 17:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 614958886e7fd51aa02b001cb6ff25be SHA-1: 662918ab22c9e7fa46461ed7de6124d0169092fe SHA-256: 56b557571e4a776e335eec2eb7f918468972c075c86750c63571437b679144a3
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/123?keyword=snowman+christmas+tree+at+walmart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f879fe9a798c.pdfIn PDF document text
    • https://jikubefu.weebly.com/uploads/1/3/4/3/134318914/f75aa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004281.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004281.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off000072d0.bin)
    • https://s3.amazonaws.com/nowonovege/balance_sheet_of_a_company_2016-_17.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/vivedatewagoponevij.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/18640395922.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nexatopawufuxabele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a903278-95de-4fac-8611-11c68366801a/jenusepazifulugame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/5743410478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5865/7430/files/best_free_dlna_client_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/earthworm_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/savinakepot.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/47722506408.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_off00004281.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4281 5024 bytes
SHA-256: 2ad7347ed557cef74b177a1303e4a5dafc540a5e73d10882c5dc40d0c4ebe9fc
font_01_sfnt_off0000535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 9248 bytes
SHA-256: f4458fa9c9346a6c4a75fb48ea044ead9019a7ffed5c8a37d14940a7b938a8d5
font_02_sfnt_off000072d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3