Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f28b1687d5a423…

MALICIOUS

PDF

46.8 KB Created: 2020-08-17 10:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9e40f48c0d4d0c61ac1a0bf6dd4712b2 SHA-1: ae456546d5dba3482b3cb24328700a5f068117dd SHA-256: 13f28b1687d5a42309eac371642566e281a8d03819f1367def94306bb78a3437
194 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, including one that redirects to a known malicious infrastructure at 'https://ttraff.ru/pify?keyword=certyfikat+kompetencji+zawodowych+ksi%25C4%2585%25C5%25BCka+2018+pdf'. The document body and heuristics indicate a lure related to a professional certificate, likely a phishing attempt to drive users to malicious content. The presence of numerous external PDF links further suggests a link farm or SEO manipulation tactic to obscure the malicious destination.

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=certyfikat+kompetencji+zawodowych+ksi%25C4%2585%25C5%25BCka+2018+pdf In PDF document text
    • http://semaleva.carolinagunter.com/uploads/1/3/1/0/131069759/3723e50.pdfIn PDF document text
    • http://pemevumo.danielholihan.com/uploads/1/3/2/3/132302984/fazur_zejodarilezexem_wexige_gesaburasegag.pdfIn PDF document text
    • http://files.blueridgecru.com/uploads/1/3/1/8/131871864/jumuzosen.pdfIn PDF document text
    • http://files.scanlonet.org/uploads/1/3/1/4/131453350/gewimasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5505/5002/files/kajojewejigutekavotavim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/zesimeremukas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9272/8224/files/53208451276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/koludojimifanubexolibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/soxumufowij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7022/5558/files/41760116355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/bosofunoxadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/64289655952.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9714/8836/files/al_quran_versi_indonesia.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 5

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_off00006106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 6416 bytes
SHA-256: 208855f2aa4e5a3653f3ca4770432d6c6edd21438bf33bf4ecf793983c112f0a
font_01_sfnt_off00007630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 12376 bytes
SHA-256: e0a4ebf28e4bef62b9ae8972cdfbf8b71baf92884e91517eb1bd5a7ea5368521
font_02_sfnt_off00009d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D43 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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