Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8cd9707444e2e2…

MALICIOUS

PDF

64.6 KB Created: 2020-09-30 09:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4a2d26c2cebc97348bab63b0ae94c730 SHA-1: cc4b6ce04a7f393dcb46aa0dfcd4963afaa1bdd1 SHA-256: 6b8cd9707444e2e227d654a44e89bca8b332bd7396d1e14b6342bbe06930d5a2
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=hans+welzel+teoria+finalistica+pdf In PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/84969992231.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/57724569120.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/28959212993.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/64148524810.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/70902254077.pdfIn PDF document text
    • http://files.lenaherveybaycelebrant.com/uploads/1/3/2/6/132680808/a219a22f209a.pdfIn PDF document text
    • http://files.contractresource.net/uploads/1/3/0/7/130775229/rezis_pifaporot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/62963596128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/37127707667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/landlord_bond_refund_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d2d5f4-9ac0-4e81-b99c-30ad9bbcef70/89785521565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7804f0ee-100d-4b88-ae31-5bc57a26a8b8/3121811440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0bc700-86d9-4cee-b62e-cd9af1ba9e5e/58995752212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb11037-d46d-48ec-97c1-07e73b593797/zevezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7b77f4-16bc-42ba-9533-23436794693e/ziweluja.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAE 5252 bytes
SHA-256: 715ffbf691a8bf15ad395464127e2952651c336565748f74a6881f5d4a033371
font_01_sfnt_off0000bca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 7308 bytes
SHA-256: d63234116988417e6fe0e143709e08b1355647352898466403c2c442413ad6dc
font_02_sfnt_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 10872 bytes
SHA-256: 9a8c6bde4f1a9a69f1f1f347f2813b2225a34fecb951338e58096bea929b5818

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