Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4af37fdc847fa6…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 02:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a5725871268c4dc302c36122a3ace2e0 SHA-1: 81a2641214eb2fa288e0762392f1bc68834fd588 SHA-256: 7f4af37fdc847fa60c7d779446af92a199bb8b521e4faa93d4795f12d8696685
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. This suggests the document is part of a link farm or SEO scam designed to trick users into downloading potentially malicious files or visiting compromised 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=antigona+lektira+pdf In PDF document text
    • http://files.joekieferart.com/uploads/1/3/2/8/132815791/nakiv.pdfIn PDF document text
    • http://files.mosaicfamilyinc.com/uploads/1/3/0/8/130873942/dixasesevex_xuvina.pdfIn PDF document text
    • http://files.ndt-resources.com/uploads/1/3/1/3/131379730/a91ae5.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/1/0428/9835/8432/files/21244882445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6548/1118/files/el_aprendiz_de_brujo_1_pnl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/40765261694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/0204/0217/files/cidco_lottery_result_taloja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/monitoring_and_evaluation_tools_and_frameworks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/diccionario_biblico_unger_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/kutejawujidunukuxezat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0986/7929/files/85764222353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/52174396156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/49096307936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/96382461576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/45278745543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/xewunikesozow.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 2

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_off00006896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 5084 bytes
SHA-256: 9bf901b04f0bc2fdf4d800685af6fa6724cf3f3e3ea3b85e1ad8e5d6e5d85424
font_01_sfnt_off000079f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F1 9780 bytes
SHA-256: 7c7b7e54f6a0377cfc472820c4ea3c11af3bf93e8f2818d45b59a634d04b5704

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