Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bf20dc376aece5…

MALICIOUS

PDF

44.1 KB Created: 2020-10-28 17:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f14cea7efc3d565fb91ad138e25ca0e1 SHA-1: 1dfcf5087aa9ce2e94a50f51c43015377d8f1b53 SHA-256: b3bf20dc376aece5b3d41f33a9df80065418270b12498bdc3dafe34c93fb1e98
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/pify?keyword=minecraft+berries+mod In PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/dumirisefamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9278677c66d.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/6deb139a8eb.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/lakadax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f8c0c0fc2b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f8b4cff79b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f95412a64a7f.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/dd8aa7a0e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006e66.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006e66.bin)
    • https://uploads.strikinglycdn.com/files/f43f329c-b763-4b5a-8d4f-6e99d3751834/busaribikajuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/rca_universal_remote_manual_rcr414bhe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/94785949278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/fikanokidew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6504/8733/files/poems_with_imagery_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1825f8-2069-4067-85a8-ba979064f4c2/23439945134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8597/8518/files/silence_in_the_age_of_noise_goodreads.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2070/0824/files/commodity_option_pricing.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 extracted file (font_00_sfnt_off00006e66.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E66 5280 bytes
SHA-256: 02f10b9f6a4f5e4aef9cd19dd5600c2bc2b322ffc63647aa7648d0125c33c76c
font_01_sfnt_off0000804e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804E 10188 bytes
SHA-256: 8ad7a362a277495dff0e5100aaaccc7bdba4c85c1586aedc91983576969cac00