Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa850ba9840856e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-17 01:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b7df52459aa3226ddbc7f43d7d041de SHA-1: 73105b4dd2aae89f249089bd3b3e3e8125f97d9e SHA-256: 3aa850ba9840856eb1655a7f26e46fa9bc573a80b1eb0dea880108f3c93e17d0
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for '3d cad files free' and the URL 'https://ttraff.cc/pify?keyword=3d+cad+files+free' is present, confirming the redirection attempt. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic.

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=3d+cad+files+free In PDF document text
    • http://files.puellarumacademy.com/uploads/1/3/0/7/130776728/fozadefuxizime_bavuxixigaf_fisututekedaz.pdfIn PDF document text
    • http://files.karrathacaravanpark.com.au/uploads/1/3/0/7/130775730/lozipulub.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/1/0434/0400/1443/files/antioxidantes_endgenos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/kazowamom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/43514089156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/79367859460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/fulepeziv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/ritogun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/guadalajara_cardiologia_8_edicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/fatufivuven.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1742/6328/files/decameron_boccaccio_italiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5203/0357/files/64408182345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/ds2_cheat_engine_table.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_off000086c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 5084 bytes
SHA-256: a3560950af5c04556e557248186a82310f057c51bafa964d46201b7eb119c7ce
font_01_sfnt_off00009809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 10700 bytes
SHA-256: be2bf840901868e660794d56153b788e5e5b32365a8db0ef071c95242c305128

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