Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21afc6b415f0192…

MALICIOUS

PDF

46.7 KB Created: 2020-10-01 17:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b0da9f38b026bee1814450d6670a5e24 SHA-1: e008de1dac73e9f84467015e11f409ae1d076dfe SHA-256: b21afc6b415f01929c2c290a6975e023639c6eb36987c8eae9928512f0cc7a89
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://ggtraff.ru/strik?keyword=indian+awards+list+pdf+2019 In PDF document text
    • http://files.singerbec.com/uploads/1/3/2/6/132695535/1099941.pdfIn PDF document text
    • http://files.kalrucker.com/uploads/1/3/2/6/132681448/62bc04.pdfIn PDF document text
    • http://sufigi.auswesternsaddlery.com.au/uploads/1/3/1/0/131070450/1817249.pdfIn PDF document text
    • http://dujuri.anewagingmovement.com/uploads/1/3/1/4/131436977/4f1a7bd7229a582.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/0e57b001-a22d-43d9-a353-3d6a3d479379/pojazojemidamebepitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b716d7-ca7e-4fdf-a593-5934faf14f5d/5119100548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21dbb0f-7fc9-478e-b178-23a7472ca40e/davabebolewobikotadir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8343/5674/files/35961723867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/vishnu_sahasra_namavali_in_gujarati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3013/3408/files/37921273141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/dejidejopupekogina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70aa71c9-1e6c-4c38-ad2a-a1139e58e0df/33914610297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad8c4bc-fe95-48f3-b612-1879fc1c8454/tilikejafimemonasex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13389335-2e74-4715-9786-5bf4b6aca82e/11663491625.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 5548 bytes
SHA-256: 5bd8c05ba3b1f2cd6f5823f37072a4a8b8fd2235df174c8ca1ca2811bad2fd02
font_01_sfnt_off00008031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8031 1912 bytes
SHA-256: 5ffeb62cc735427a844e4fc30fe3f408afa3be4b10dd737b69049c1a099b5cd9
font_02_sfnt_off0000895e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895E 10644 bytes
SHA-256: 0d5fbfaa0684654ffeef934c40d5e6905eeb89cb118ca91378ac3025a50294f0

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