Malicious PDF — malware analysis report

Static analysis result for SHA-256 2547c2734e659540…

MALICIOUS

PDF

48.4 KB Created: 2020-10-10 16:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bf424b519f3cc76d55ff5428311ae968 SHA-1: af52ff0bc0fd3380e92054701e9c8ba410049bcd SHA-256: 2547c2734e659540c0419c9bd5624915402ed9b6979a73f92e89791c0f8090bf
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://cctraff.ru/strik?keyword=school+board+of+highlands+county In PDF document text
    • http://wikameki.atplaygames.com/uploads/1/3/0/7/130738625/rifopadovuludekasogi.pdfIn PDF document text
    • http://files.eugeneglassroots.com/uploads/1/3/0/9/130969981/witimuw-kufarasitixe-rodogasixawab.pdfIn PDF document text
    • http://files.psmuseums.org/uploads/1/3/2/6/132683000/2832031.pdfIn PDF document text
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdfIn PDF document text
    • http://files.lightsoutgrace.com/uploads/1/3/0/7/130775980/repedilomazokez-rapofapewolimoz-norur.pdfIn PDF document text
    • http://files.999fm.net/uploads/1/3/1/3/131380504/4954505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3111ba65-69ae-44ce-a6b1-eab85be89bc0/mupifufofalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00c74ef-ea15-48ec-b62f-bb03aca7cf9c/58718654899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b279424b-4714-4196-9fb0-7d6babda3c48/kimijij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d537a9bc-1c5f-4ea5-a290-ab65f75d513c/vegivirikivabamutinuwerot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b92506-6362-4fdf-ab63-830abd7e51a6/86480049478.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_off00007e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E10 5628 bytes
SHA-256: 9481f3b35f041d72e39fbcaf06659f10c268eddc1a4ace8cc3a73d577c43bc99
font_01_sfnt_off00009130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9130 10524 bytes
SHA-256: 82f5d810b363644268d57e62f5c8a3192fc42d392db2e0a713f13093f7c06df8