Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b62df65664d85fc…

MALICIOUS

PDF

37.0 KB Created: 2020-09-28 11:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: d4a1c0b17629a4aa077472341b82f76b SHA-1: 63476474cef432276fd459a1afba0fbd49ec762c SHA-256: 4b62df65664d85fc7e08e55d4dfd1b423e1723d4619fbeb66bba32a2055a7741
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.club/pify?keyword=homeworx+digital+converter+box+manual In PDF document text
    • http://fijen.lifeafternarc.com/uploads/1/3/0/9/130968979/2097f9af.pdfIn PDF document text
    • http://files.isolationdrawing.com/uploads/1/3/0/7/130775786/widut.pdfIn PDF document text
    • http://files.migrainepro.com/uploads/1/3/0/7/130775590/vuvawibigolo.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/1/0435/8796/0989/files/vunasedelori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6422/0055/files/14808703303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/porodabebufesewiwovape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/xanefovikunitesemepima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8791/5925/files/93349398175.pdfIn PDF document text
    • https://338bbcb5-1588-4ef2-a771-f6559bfefc05.filesusr.com/ugd/73c254_3d8426f1ee5249cfb61125fa60e17495.pdf?index=trueIn PDF document text
    • https://e47fe20f-4e23-4caa-9a49-9c11b7327942.filesusr.com/ugd/682d1c_a4061806225f48a0bda000955fe089e6.pdf?index=trueIn 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_off00005213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5213 5400 bytes
SHA-256: d31de2eea1b243e9200941c3327c3f581623702110b28934910e9af7969bae6b
font_01_sfnt_off00006472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6472 10332 bytes
SHA-256: 9bc3a3d58ca2d554178e064e7c4ccf76a0f09d80823457ce092b037911887725