Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8880517e543411…

MALICIOUS

PDF

44.6 KB Created: 2020-10-08 19:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b9069cdb50dcd6287578e476aec230a9 SHA-1: 408d5e20c25c429f5fd4d79f5b87e414008abe3e SHA-256: 4d8880517e54341184230634eedf23f9e6e35be0b15fb5c7d4dc0cb81f178803
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=clases+de+palabras+ejercicios+resueltos In PDF document text
    • http://files.katiemichellefriedman.com/uploads/1/3/0/9/130969671/628273.pdfIn PDF document text
    • http://files.smilinlight.com/uploads/1/3/0/8/130813645/sivuf.pdfIn PDF document text
    • http://sateze.ceradwen.com/uploads/1/3/0/7/130776074/dc8bc152.pdfIn PDF document text
    • http://kepiri.henrysheartarttherapy.com/uploads/1/3/1/4/131413418/febotojobokozususuj.pdfIn PDF document text
    • http://dapipuzi.joannecalmel.com/uploads/1/3/0/7/130739607/tisisowedotuzofegewi.pdfIn PDF document text
    • https://site-1042347.mozfiles.com/files/1042347/27981880731.pdfIn PDF document text
    • https://site-1042619.mozfiles.com/files/1042619/54072513116.pdfIn PDF document text
    • https://site-1043260.mozfiles.com/files/1043260/fupevodibanefovusogalafe.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/jojafavimobexo.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/73875583483.pdfIn PDF document text
    • https://site-1041384.mozfiles.com/files/1041384/pawabinoputomipuxenoneku.pdfIn PDF document text
    • https://site-1038413.mozfiles.com/files/1038413/86825725711.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/1/0429/3971/1644/files/34450077347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/ravefonufesajimuzumobokid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7371/8422/files/3020681289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0699/2799/files/zinuzoxadix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9222/3174/files/celebration_cinema_rivertown_matinee_prices.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_off00006bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 5188 bytes
SHA-256: 458a7420ec8927e57c1778c2c2b5bf52f282f8ba7c63e797bebda50b81f32e42
font_01_sfnt_off00007d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9F 11976 bytes
SHA-256: a089e0cb36f7dc485902b87b843bea701cf6be100d89a748f821e0bd3e775820

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