Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a7b22c084090d5…

MALICIOUS

PDF

42.3 KB Created: 2020-10-06 12:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e4742177b60898b5ad381f9603b7dcde SHA-1: cd234c7d15ce0e29a3b0ec918798a948a7151a2d SHA-256: b7a7b22c084090d5b7e597d33df340c113b3bab38149bc8745c4ca7e81487db2
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://gettraff.ru/strik?keyword=rational+numbers+worksheet+with+answers+class+7 In PDF document text
    • http://pabevo.koalait.co.uk/uploads/1/3/0/9/130969336/moxozizifagofa.pdfIn PDF document text
    • http://files.danigosha.com/uploads/1/3/1/0/131070765/9235497.pdfIn PDF document text
    • http://sifezopo.3ravenstattoo.com/uploads/1/3/0/7/130776763/3499925.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/39921390514.pdfIn PDF document text
    • https://site-1036965.mozfiles.com/files/1036965/mutogafi.pdfIn PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/lijunilejajemi.pdfIn PDF document text
    • https://site-1040134.mozfiles.com/files/1040134/dejebagaxigunelode.pdfIn PDF document text
    • https://site-1043487.mozfiles.com/files/1043487/99095877001.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/1/0438/0377/1041/files/mcdonalds_ty_beanie_baby_collectors_value_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/troy_bilt_flex_mower_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4779/2021/files/school_counseling_interview_questions_to_ask.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/pudiluwod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/70951168227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4281/1289/files/graco_sweetpeace_swing_weight_limit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/wiley_plus_chapter_3_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5111/2858/files/66277691651.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_off000066d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 5420 bytes
SHA-256: 74f9468bd9cd48390011c1933ba1b9a1b5f3acba3ef952ef5b63ba56bb03f589
font_01_sfnt_off00007935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7935 10252 bytes
SHA-256: 20b87c20857d5e3fc9fb2a28b621e19e5bbddc595cd04e7b10590535d7162f83

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