Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8264af2e81fb4b0…

MALICIOUS

PDF

47.2 KB Created: 2020-10-08 04:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 30f16bd6170ec15841f1fe8cd3977a77 SHA-1: 6478e9ac20fb8a8b0e12a3c819ec41a09e32bf6f SHA-256: a8264af2e81fb4b0e86c7dd2741817f4a70379b5d57bbf27a0a534f252c0ad05
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=motorola+walkie+talkie+manual+k7gmhbcj In PDF document text
    • https://site-1037827.mozfiles.com/files/1037827/14357313869.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/vililekun.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/vaputajekarizu.pdfIn PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/siloj.pdfIn PDF document text
    • https://site-1039133.mozfiles.com/files/1039133/54071158788.pdfIn PDF document text
    • http://files.ladlelove.com/uploads/1/3/1/4/131483002/b23fc6d2569b.pdfIn PDF document text
    • http://files.beadsandleather.com/uploads/1/3/2/6/132681536/4159012.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/39113492-7638-4c1d-b48a-e7dac7f7337f/54223489501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f066c3e0-7413-4e73-a401-81f492885654/39981539826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5157cd59-8154-40ba-96fb-a93f8ca52343/benakin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc5732b-0464-4e6b-ab03-ec645c6aa0d4/14974902604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/67722243530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9074/2947/files/gugging_swallowing_screen_traduccion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/sti_driveway_monitor_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2940/8155/files/krait_mkii_vs_phantom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6444/9431/files/6192721552.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_off000079d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D2 5492 bytes
SHA-256: 8ebf8f9269f400ccc8605a4eb37a24fbc26881c490a8eb8672571a54b7b50b70
font_01_sfnt_off00008c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C87 10328 bytes
SHA-256: 25e02fadee6d6cb0a2209adfd1a9676ff6f126f2889c8814d334e47b3e449268

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