Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8823c97086932b1…

MALICIOUS

PDF

41.8 KB Created: 2020-08-05 12:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b917445b695cb8dad51d7021924a02fb SHA-1: f9835c66c1295c1896abcb1f378fcc97b38dfb32 SHA-256: c8823c97086932b1eda06c98957d0a2e06201e489f05137cd7322869e4ad8233
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, with one URL pointing to a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=la+caccia+al+tesoro+camilleri+pdf In PDF document text
    • http://files.realestate-swla.com/uploads/1/3/1/1/131163834/81885.pdfIn PDF document text
    • http://files.theballstrikers.com/uploads/1/3/0/9/130969624/nifekomuzutil_zagixulol_leluluwelune_beridaguniwoti.pdfIn PDF document text
    • http://files.alphafitnessclub.com/uploads/1/3/1/4/131483201/2931875.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/1/0437/7287/0807/files/xudanimuwujitin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/79076066143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9775/9648/files/kebid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/72810380762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/gajijulumuxolebejukanaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/65709940119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/70896494107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/indent_in_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/49072410939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/jusamezokesonoguxesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/fijikuloluzavegewagumad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/69222556895.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 7

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_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 5240 bytes
SHA-256: 2f2d13aa2bd073e7a292102f8432870a2ef87b9e7de9250884833c8138c40d36
font_01_sfnt_off000076d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 10956 bytes
SHA-256: 07d325acf054ad7c2d6703393434a19e47e3cf16053a87367f95fb6e70fca498

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