Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc4de4becaf842f…

MALICIOUS

PDF

42.0 KB Created: 2020-09-19 20:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 0408283c4692f72ecbc3d88809f5fd7e SHA-1: 3c3e04fbe40dbd9177ba8417c5434d14aacdfe07 SHA-256: cbc4de4becaf842f346cc9358f871763f938d9409233b8d80d0320f7a43269c3
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://ttraff.link/wix?keyword=ornate+tortle+hunter+guide In PDF document text
    • http://zimofili.sadahespiiproctor.com/uploads/1/3/1/8/131856539/texinuxawozek-tovoj-pikipopekuxoli-wasulazopanosur.pdfIn PDF document text
    • http://xisategun.4tvirtualcon.com/uploads/1/3/1/3/131380600/mawodanazunubalax.pdfIn PDF document text
    • http://powumi.yurrugarett.com/uploads/1/3/0/7/130775118/8781265.pdfIn PDF document text
    • http://files.ezra728.org/uploads/1/3/1/6/131606874/6664519.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/1/0428/7207/8499/files/jofojabebogud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/cdc_flu_vaccine_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6107/4088/files/63865186279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/section_1_forces_within_earth_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/personality_vocabulary_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/5274/5123/files/oxford_bookworms_ebook_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8853/8525/files/bavularofulutavizanumuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/31849338546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/pubulowuxetixazapofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/jejoloxomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5254/5686/files/ronesovitikixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1862/8505/files/wenejakexotixaxizoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/tasexigaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/46884493088.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_off00006687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6687 4936 bytes
SHA-256: 2480122845237165e40cdf07667efe2b0d9c216764b0d1b7c0fdbb7f76fd2d82
font_01_sfnt_off0000773f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 10420 bytes
SHA-256: 402ef7a774371057143f7a0c9e93d6abad712f2064294ee7e3d62437c5eefc33