Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef123d74a4a6c854…

MALICIOUS

PDF

46.9 KB Created: 2020-09-29 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 184f1443dac488501dea8ba7d08ecbc8 SHA-1: 668d3710c28de432327d4aa9f672465663538e74 SHA-256: ef123d74a4a6c8546f3e5c84fdeeb4a9a6a2b52f4506109ace4594baf621af3a
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.me/pify?keyword=mermaidman+and+barnacle+boy+v In PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/bevowelexa.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/26350690034.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/pozisunijosuduboxexov.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/nizezipejuz.pdfIn PDF document text
    • http://files.americanindianjewelry.com/uploads/1/3/1/6/131606968/d9c2809.pdfIn PDF document text
    • http://files.200-20.com/uploads/1/3/2/6/132681308/rubejokifax-gagozekazabut.pdfIn PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/femiguwamiwenoz.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/86533218859.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/1/0431/5794/6522/files/turokaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/jeep_wrangler_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5197/2768/files/nenoxenesudagura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6089/5384/files/39529155163.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_off00007a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A08 5212 bytes
SHA-256: cecf71c262f3206ee55301c2d161c5229e99f8c039d73841560c4c71d8eff1f8
font_01_sfnt_off00008bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC0 10328 bytes
SHA-256: 59bd4bdb9cc82b8183889f6b13f99287d6387d52e6e52e3c0f775588e1682171