Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9faa8793b731c5…

MALICIOUS

PDF

49.7 KB Created: 2020-08-06 03:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5630e0c9bcda68408f89b6a21b59ada0 SHA-1: bbb9485856d68ef1f80a7d7b6fc4ad7f81ad20bd SHA-256: 4e9faa8793b731c548edf8d08c7b00cff73ab1a139ac19974233b1880635ffcf
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.com/pify?keyword=oxford+phonics+world+1+workbook+pdf+download In PDF document text
    • http://files.lauramgray.com/uploads/1/3/0/7/130775970/boramora-zakifil-torofugavuken-fekaxagag.pdfIn PDF document text
    • http://putabo.happydogsaigle.com/uploads/1/3/0/9/130969573/xosemuwifunej_jodudivubu_jugebu_rivopukunuxi.pdfIn PDF document text
    • http://files.exquisitepeace.com/uploads/1/3/0/9/130969270/nabimik.pdfIn PDF document text
    • http://batufuvel.instoredisplayuk.com/uploads/1/3/1/0/131070493/8868837.pdfIn PDF document text
    • http://files.soccerplayingmomct.com/uploads/1/3/2/7/132712451/1639684.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/1/0431/4729/6924/files/fobaloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/convertidor_de_celsius_a_fahrenheit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/53509321131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9531/7918/files/85273906247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/fibasowurasepomisamiji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/nivupivilamelidanetaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/wodobezamekeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6774/4160/files/66928265912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5699/6260/files/96439852562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/68305477687.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5688 bytes
SHA-256: 6305cdffc25d394f34d19c8ec7987a75ed32edccf1f638170295275eede3bad2
font_01_sfnt_off000079a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 12744 bytes
SHA-256: 4ab202bfeec1cf21907f7b232bc1c53dbdfec111b6410b22347bb5824a9218f7
font_02_sfnt_off0000a3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A1 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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