Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a73b99b31addf8…

MALICIOUS

PDF

36.2 KB Created: 2020-08-05 06:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a9d95106b7cb1a6b17c5076c5c6d1bce SHA-1: c666f87c7a8c44796f60ae72d7408d0b739ae2a0 SHA-256: c5a73b99b31addf8467daa6581f0cfcfd426d0a131ff9ad99290bd4f027e6780
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body itself contains obfuscated text and references to download links, suggesting a lure to external malicious content. 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=evangelios+apocrifos+pdf+descargar In PDF document text
    • http://files.fraterautomation.com/uploads/1/3/1/8/131871433/nivedipumazezi.pdfIn PDF document text
    • http://files.orlandokb1.com/uploads/1/3/1/4/131452811/febivi_rurade_gejuraguxok_wizogaxumageji.pdfIn PDF document text
    • http://files.dragonchoirs.net/uploads/1/3/1/3/131380504/nebemebiber-gorik-fiwumoxunubowe.pdfIn PDF document text
    • http://files.thewomenof353.com/uploads/1/3/1/6/131607321/lonabitalejawubalale.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/1/0436/6965/1606/files/java_1._8_for_mac_install.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8714/8694/files/44512216324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/31573233120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/32224745777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/sajopugiribadogoxafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/59828467640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/jirodupobofisev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/zixanalikamom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/konetukogulamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7446/1594/files/kameb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6498/3701/files/anxiety_disorder_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/mepevuwogadaxemizumun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/9730935217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9557/0072/files/54978801369.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D62 5340 bytes
SHA-256: 37e526592edeee92bb46549536a7ed58c00b4f54119b3741fce835f791f8ef20
font_01_sfnt_off00005fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA8 10560 bytes
SHA-256: 5b511628e31ace97960d9fd69b830ad12f3b95a31ba208607eaf993cc9f95b7a

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