Malicious PDF — malware analysis report

Static analysis result for SHA-256 872a6a2651fcd63c…

MALICIOUS

PDF

40.1 KB Created: 2020-10-08 18:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fba32b410b7023dd4b7470de640c235a SHA-1: ec8588d658fc465b27dff1792ff4a5e9a736f832 SHA-256: 872a6a2651fcd63c38c89da2d576431abeae6736286c6c7e491a881426ce7d23
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=spanish+grammar+rules+cheat+sheet In PDF document text
    • http://files.salsaritaslexky.com/uploads/1/3/1/4/131438195/ce080861b.pdfIn PDF document text
    • http://files.lochgoin.com/uploads/1/3/1/6/131607239/gutexal.pdfIn PDF document text
    • https://site-1038789.mozfiles.com/files/1038789/38361492859.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/kizefabefizexunufaxaguda.pdfIn PDF document text
    • https://site-1038605.mozfiles.com/files/1038605/73990151524.pdfIn PDF document text
    • https://site-1048226.mozfiles.com/files/1048226/24926166144.pdfIn PDF document text
    • https://site-1041934.mozfiles.com/files/1041934/80976226538.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/1/0482/7575/1067/files/nyp_brooklyn_methodist_emergency_medicine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8392/6166/files/throne_of_glass_book_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/9439/4278/files/above_ground_pool_heat_pump_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5835/4584/files/jozufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/40458640383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8846/5054/files/pipopafokixopazisujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1626/6150/files/rappelz_leveling_guide.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_off00005efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5448 bytes
SHA-256: 7b20fae30994982d5cff4be61f313cf00ed518b0d58254a95fd35e57a88be5f6
font_01_sfnt_off0000715d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 10060 bytes
SHA-256: 374fcbab2572aeb0980449de35b24de38bbf984e4244f6f1c6ad64ad73a89915

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