Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6251f1b9fe45921…

MALICIOUS

PDF

40.5 KB Created: 2020-08-01 01:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f179d607b5a6db9a08d525d2df03bf8a SHA-1: be730a34c2a179a0fe88fda4edd911cb021528ef SHA-256: b6251f1b9fe45921917d21251d10601d9eafbfd22818755153b0f69a320efb57
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.ru/pify?keyword=briggs+and+stratton+270962+pdf In PDF document text
    • http://files.sendingasmokesignal.org/uploads/1/3/1/8/131856277/guxovago.pdfIn PDF document text
    • http://files.thebeachhousestyle.com/uploads/1/3/1/1/131164157/xanuwaw.pdfIn PDF document text
    • http://files.mrwhitcher.com/uploads/1/3/1/3/131380889/nulivulamibixi.pdfIn PDF document text
    • http://files.mainehunterjumper.com/uploads/1/3/1/3/131379503/rezajebetugagujo.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/1/0432/3642/5883/files/favafar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/jowalunowikepewub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/bodumezag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/24211694074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/fazalorodake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/xoxewule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/72376963489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/31296482821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mowajuvide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/40935568474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/nonazawaratiwosuba.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_off00005eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBA 5892 bytes
SHA-256: ce844ee4b4f0aa1ca006916baca6dfad4cf61c3b3184611af444787a0933ed8a
font_01_sfnt_off000072d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 10064 bytes
SHA-256: 4b198c1c2ae7f2eb162c6eda83b1224459cc58fd0281e2c6c48ac6476b1183d2

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