Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf3fd93028bc673…

MALICIOUS

PDF

46.1 KB Created: 2020-07-26 14:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 8b777a32c7967a1589cbc85060c655a2 SHA-1: 6a699239386e51a4f2cd2efaa48bd5b25b2339a9 SHA-256: 5cf3fd93028bc673af138fdd77d82b1bb8b2fcce89d70bf6feed203462309678
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.cc/pify?keyword=brief+formulieren+englisch In PDF document text
    • http://files.handsonhexham.co.uk/uploads/1/3/1/8/131857565/lazanenidijel_livom_nepul_tifefinewa.pdfIn PDF document text
    • http://files.metropolitaneprep.com/uploads/1/3/2/7/132740277/ludalejerunuxokibewo.pdfIn PDF document text
    • http://files.mydualschools.com/uploads/1/3/0/9/130969974/kidesopofezab.pdfIn PDF document text
    • http://files.reginastarkgallery.com/uploads/1/3/1/6/131636665/3609937.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/1/0434/4581/3413/files/rapumibimidexezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/polexebalatidijemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/65713362387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/21302944238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/wofumegakomolodorixeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1669/8526/files/rinapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/rebaxiwiroxepomedufa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/88522550581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/63938518566.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_off0000782e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782E 4936 bytes
SHA-256: ccee1f21fad9659bcabfb28da1c00b082f6d0110a6bd925f0f854cc0bae51559
font_01_sfnt_off000088c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 10416 bytes
SHA-256: 0c6ae76543ac5e033d7c72ef79fdee43f0ee82bb71cfd8ab2dfd9029cfcff39b