Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb702a84ff39bb5…

MALICIOUS

PDF

55.7 KB Created: 2020-10-04 10:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 50f3301817047491dd363036a15bf413 SHA-1: f83df8845326a38a1d53e106baa4252c34a49aff SHA-256: fcb702a84ff39bb54104f96922806e4c684cb64063d7e2547156ae10ca244aff
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=narrative+paragraph+outline+pdf In PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/972371792.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/86602935572.pdfIn PDF document text
    • https://site-1038627.mozfiles.com/files/1038627/97833878351.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/kisatelamojakidovaxelitus.pdfIn PDF document text
    • https://site-1039899.mozfiles.com/files/1039899/41599302238.pdfIn PDF document text
    • http://files.nirvanatails.biz/uploads/1/3/1/1/131163632/3919430.pdfIn PDF document text
    • http://bikuwake.lp-learningcenter.com/uploads/1/3/1/3/131383483/8888c3f.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/1/0436/6296/6937/files/27438107930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2571/8184/files/k_means_clustering_spss.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9566/5056/files/sandbox_flash_games_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/nefokamibirejawin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35a8f08-0926-446e-8f8c-59d860ea2702/muleguxabotix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bcabfb-6691-42b7-94a7-97eb44632444/11946797913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b270bc1-fe80-4c38-b4ca-6365f8c34a68/81946683938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093b4754-7407-431e-9c0c-7794319627d3/88935607920.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_off00009e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E12 5152 bytes
SHA-256: 97b3cc06cfc503603ceb81b91fbd6540b1cd366d99caa82b2a8449aeb58f7cfa
font_01_sfnt_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 9968 bytes
SHA-256: bd48e66495468313a680c059bd2d52bdb05f5386f39dcd2f35caeefb3c3f6e94

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