Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f6457bbea677ef…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 09:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a4b0b6661c1c010e249586300ec3ebec SHA-1: d4bd14f85450c3e191d576283a2c20a513e7a0d0 SHA-256: 78f6457bbea677efdd46df2681697b55c69e7b8bf0213ab1e95565ac81d839ce
194 Risk Score

Malware Insights

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

The PDF document contains a lure to insert a digital signature, which redirects to a malicious redirector URL. This redirector then leads to a link farm of 15 other PDF documents, likely to obscure the malicious intent and spread the attack. The ML classifier strongly indicated maliciousness, and the embedded URLs point to known 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.cc/pify?keyword=inserir+assinatura+digital+pdf In PDF document text
    • http://files.well-estar.com/uploads/1/3/1/6/131637034/91a0067.pdfIn PDF document text
    • http://files.theteenspire.com/uploads/1/3/0/7/130775830/14f1c97e48b72a9.pdfIn PDF document text
    • http://feres.badassgirlworld.com/uploads/1/3/1/6/131606349/jidomeda_weguwovodolijiz.pdfIn PDF document text
    • http://files.faithbaptistchurchministries.net/uploads/1/3/0/8/130813834/fexetobobokida_rokiri_wakefibovu.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/1/0429/8529/1937/files/pitexoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/povuwanuzik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/18828071028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/63265871458.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/abstract_reasoning_test_test_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/capelania_empresarial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/18230674656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9716/9824/files/55914674994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6733015585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/convert_to_autocad_file_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/dapel.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_off00006abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABC 5148 bytes
SHA-256: 0d54fe45ddf651d90f012401f1919b068fd9146797c0524e089cd515022e5e35
font_01_sfnt_off00007c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C48 10028 bytes
SHA-256: 9b5e93a759a255a449d717ed628063c2ec6345794edff912682fdebc7ed94c12

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