Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f86d88500cdbd1…

MALICIOUS

PDF

39.0 KB Created: 2020-09-25 03:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c3341cc3b2fa68f1d60e0f586ffe4db0 SHA-1: 30537e7b301b582bf992a5f2688593ce4c784a93 SHA-256: 77f86d88500cdbd140d4e2a1768e6da992c4b0e4d7b271a57631a9865b89d61d
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://ttraff.com/pify?keyword=man+play+and+games In PDF document text
    • http://wawoze.michiganrealtysolutions.com/uploads/1/3/1/8/131856331/1938115.pdfIn PDF document text
    • http://wezodi.dmserra.com/uploads/1/3/1/8/131856097/7537575.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/1/0430/7661/6341/files/61661183262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6565/4946/files/kavutajilixogewigiwutano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/employment_reference_template_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/57829750816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/56251452255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/structural_adjustment_programmes_in_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/how_to_download_file_in_php_with_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/8164/7526/files/award_show_2014_bollywood.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/xatusawuvatataxuninoxat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/23645119224.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_off00005aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 5292 bytes
SHA-256: f74a77c97b638289d66a90b8bc4f48d30963b931dc5c98a0af883999cc100323
font_01_sfnt_off00006cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC3 10212 bytes
SHA-256: d91161913f14375844d60b140959f3e56180e32e9421f30088596cf4a6f1de41