Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfcb48154d10518…

MALICIOUS

PDF

50.2 KB Created: 2020-10-01 06:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9511a4e2e53988e332aa1d3b7768f899 SHA-1: 3485e0f826497cff3175110442e8c09bca58c012 SHA-256: 8cfcb48154d105181a19f9285b1983266ef1edb3130397667beccd2d8e2a2059
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://ggtraff.ru/strik?keyword=kirchhoff%2527+s+first+law+pdf In PDF document text
    • http://kejiwe.streettattooevents.com/uploads/1/3/1/0/131070325/1cd545e7b9.pdfIn PDF document text
    • http://files.artoffood.org/uploads/1/3/0/7/130739037/8058036.pdfIn PDF document text
    • http://tudap.theperfectblackandtan.com/uploads/1/3/1/4/131483027/191999.pdfIn PDF document text
    • http://lexedexo.christchurchduanesburg.org/uploads/1/3/1/4/131407082/dinimema-fozugowivita-zukasiku-sotonurale.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/14555744113.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/18403845858.pdfIn PDF document text
    • https://site-1038391.mozfiles.com/files/1038391/20269185934.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/1/0432/3826/0899/files/nozogotiwebakesofara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/90072602432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/2504/8223/files/81813258421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3431/5432/files/a_practical_guide_for_policy_analysis_kindle.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 5336 bytes
SHA-256: 0d3ca5b0baadc981c98ee7e7af0e4872d016d48cd25da76298bbb86ecc1f0842
font_01_sfnt_off00008029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8029 10836 bytes
SHA-256: ab339b72685a65b1f2c3b5b910c60ff3a4bc036230d115bbaa42c0157c55f39f
font_02_sfnt_off0000a57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA57D 16328 bytes
SHA-256: f85bf2728e3e7ed4b93582469acf75a23f4e74ac6eca1c475110d7f59d5732f5