Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c22cdbb526f9a8…

MALICIOUS

PDF

49.2 KB Created: 2020-10-07 16:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8ef8541d2b3cf6ab51dc63fee1c3514c SHA-1: b8be90ad2bf1bb3972801aa3e71ec2471987c7ef SHA-256: c6c22cdbb526f9a81699f472dfca2e1e98a4875c0e9200be55ec504cf7b42433
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=volume+of+cyliner In PDF document text
    • http://nitejuw.providencebookfestival.org/uploads/1/3/2/6/132695269/0a1c1ee4f2b6715.pdfIn PDF document text
    • http://vefenu.revgymmn.com/uploads/1/3/2/6/132695535/2495187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0230/5957/files/kaseboxetowova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1861/6473/files/ray_ban_3447v_clip_on.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0512/4503/files/black_star_soul_eater_not.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/laguna_college_of_art_and_design_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9265/9362/files/dead_samurai_2_hacked_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0776/9752/files/unblocked_horror_games_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2344/0804/files/ramogefifetemuxusofowupiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/crater_lake_snowmobile_rental.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6899/7288/files/mt_everest_1996_case_study.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1354/1529/files/nba_2k18_offline_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3175/4902/files/operations_with_complex_numbers_worksheet_gina_wilson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0885/4696/files/nbr_5410_tabela_36.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_off000076ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CA 4508 bytes
SHA-256: 97faab23dbf78be96def858f2104761023035ae37724322ba566299c6841e826
font_01_sfnt_off0000860a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860A 10608 bytes
SHA-256: fc2ee120d2abbedca7e181dab3665650150d723cc762cb1a8924a55a72c9514e
font_02_sfnt_off0000aa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA14 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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