Malicious PDF — malware analysis report

Static analysis result for SHA-256 23efc8e1f1db31db…

MALICIOUS

PDF

44.7 KB Created: 2020-08-05 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 49d85052b7b2d7214a159b00d311e026 SHA-1: a01a86519d0e11a438160f868c15af64add85613 SHA-256: 23efc8e1f1db31db4b22d29915306e7be6189f5079ec968669ff8147cbb58fa9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=lightest+pdf+reader+app+android', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary goal is to trick users into clicking it. The file was generated by wkhtmltopdf, a tool sometimes abused for creating malicious documents.

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=lightest+pdf+reader+app+android In PDF document text
    • http://rujefor.friends4picacho.org/uploads/1/3/0/8/130813095/28e12f7f6848e.pdfIn PDF document text
    • http://xejopolu.penangfloorball.com/uploads/1/3/0/9/130969489/nekapesit.pdfIn PDF document text
    • http://files.iccspa2020.com/uploads/1/3/1/3/131398246/kudokabuxikufa.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/1/0429/5933/9679/files/76155031070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/51310772950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/39186818272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/happy_stick_skin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1324/9946/files/13894167204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/428547325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/riror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/juzabivedolaguteli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/vovozote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/newufikafusijabod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/zovidanobikotokugiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/common_3_letter_words_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/kupab.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_off000070be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70BE 5212 bytes
SHA-256: 69b3feb4eddcdf88413456eda343a923cad1f8fac859172eddb8f3127bdf2938
font_01_sfnt_off0000827b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827B 10300 bytes
SHA-256: fda1cc6b004dc5b66b6685f89a21423c8cb4be22ecdd8d8c78d913d3dd7d3141

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