Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b729407f6d49c5…

MALICIOUS

PDF

73.2 KB Created: 2020-07-30 10:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f3af7516ade6f24255cc3df6d56fb03e SHA-1: c0c2b1e9c63cc67657117c8d6d2a5f2ead270e43 SHA-256: a3b729407f6d49c50b4f04a6dcc8a4abd768c3104b9d65b08f2dcd8e0f382dd6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to obscure malicious destinations or engage in SEO manipulation for traffic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure.

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.com/pify?keyword=primer+acuerdo+de+paz+en+colombia+pdf In PDF document text
    • http://files.kefaloniaholidaysvilla.com/uploads/1/3/2/8/132814071/7060708.pdfIn PDF document text
    • http://files.flatsfishingonline.com/uploads/1/3/2/3/132302926/zolovaresa.pdfIn PDF document text
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/6/131636990/sifixoj_jutixepipi_bevasagipaxuja_sivosukisozi.pdfIn PDF document text
    • http://files.northmetroweekday.com/uploads/1/3/0/7/130776309/xaloxa.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/1/0433/0412/4571/files/solavewuvonagenate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/riseravukudukuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/27304309961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/nixetujobafapalabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6839/1591/files/61723829972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/tadaravat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7729/4485/files/nuvap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/31343021490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/27884192182.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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 5116 bytes
SHA-256: 374dccc81e301d2109a041d51e2f8bafdebd6ed155cd8d8213395a7ed8eff1be
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 11536 bytes
SHA-256: e31451bb6c50ee5a6118d1b1d4391ce1a3eaf27e22361d31b9cf9a2f10895145

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