Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d97165893482595…

MALICIOUS

PDF

39.7 KB Created: 2020-08-05 02:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0fd6f25a61d7e5cef1fb54a69328e08 SHA-1: c51a70ce05de9a6dad2b1c7627528d402106b4e6 SHA-256: 4d9716589348259521c773712d721d10ad36bbd21fbc3f512b62383aa6c24acb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to a redirector infrastructure. The primary redirector URL, https://ttraff.ru/pify?keyword=applied+mathematics+2+kumbhojkar+pdf, is flagged as malicious. This suggests the document is part of an SEO link farm or phishing campaign designed to redirect users to malicious sites under the guise of providing free PDF downloads.

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.ru/pify?keyword=applied+mathematics+2+kumbhojkar+pdf In PDF document text
    • http://pazojizin.videopost.in/uploads/1/3/2/6/132682646/junebuxivixetul.pdfIn PDF document text
    • http://files.vfxworks.net/uploads/1/3/1/4/131407284/firufidejizom_biliselode.pdfIn PDF document text
    • http://files.gracefmc.org/uploads/1/3/0/9/130969623/xijimuwiraseto.pdfIn PDF document text
    • http://files.bringingtherapyhome.com/uploads/1/3/1/4/131407521/9319345.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/1/0429/4295/5676/files/77223206324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/tawofol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/82383973602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/the_opencl_programming_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/finetutefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/chromophore_et_auxochrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/zurosawujen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/discord_block_quote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/xejeruwagefol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/mortal_kombat_2_snes_fatalities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/80970599792.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA3 5796 bytes
SHA-256: d66b5b6130b33cf9b471086a73f3118fc5ec32b9d2b67497f551f6ecec650e9c
font_01_sfnt_off00006e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 10476 bytes
SHA-256: e734938debb3ee8193d966fdd5e43af2a57c15d4a83b7992920dbcf7ca7b49c2

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