Malicious PDF — malware analysis report

Static analysis result for SHA-256 72df95a812abdcd5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 17:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b2569d2f9166a915e4eabf64b3f4b07f SHA-1: cfe4bc17e9a0b6c61a73bc1513435f2bd45c37a1 SHA-256: 72df95a812abdcd502696da90a47012419484021e957757cc179aa8a85d9d92f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to malicious infrastructure. The document body text, though partially garbled, includes the same suspicious URL and a seemingly unrelated PDF filename, suggesting a link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=big+tasty+with+bacon+nutrition+information In PDF document text
    • http://files.heritagephilharmonic.org/uploads/1/3/2/7/132710491/zibulajukopipu_tatajopivedije_fazelejorufojim.pdfIn PDF document text
    • http://pubifiv.lenisewilliams.net/uploads/1/3/2/6/132695839/3511252.pdfIn PDF document text
    • http://files.brentstrang.com/uploads/1/3/0/9/130969452/jakeredamigikuvaxobi.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/1/0435/3448/3616/files/elementary_homeschool_report_card_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/mimikojivogubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/o_mio_babbino_caro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/68344894994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/93650241900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/kajuvomizisebesokozus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2785/6536/files/counter_strike_1._6_server_steam.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 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6080 5644 bytes
SHA-256: 3a93ce751ba47461185a739f1dd2e5480427384fbd1440a7f83bd33634922aa4
font_01_sfnt_off0000738e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00007c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1C 10916 bytes
SHA-256: 776d6a15996cd3226183322acdb8225b4ab1b7f0370135baeac2031eb118fd86

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