Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63f22b3948a2a39…

MALICIOUS

PDF

41.1 KB Created: 2020-08-18 21:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d9a4e424addc1ffc5d35595cef6abe63 SHA-1: 6d198978a3989a5e2af7e3bf919421964e4dd49a SHA-256: d63f22b3948a2a3901a312560c5d1a099ebd8f036a5423cb1b85f98c95103fbb
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic and potentially lure users to malicious content. The primary attack vector appears to be the exploitation of users clicking on these numerous links.

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=android+binder+native+example In PDF document text
    • http://files.kesselaarbv.com/uploads/1/3/1/1/131164032/4528237.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/1/0432/2977/3982/files/fopedejuxonenonib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/61189391625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/31052741230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/lalimijoxupireroguzazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8818/1400/files/99384183481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/delipetugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/64008487281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/breast_cancer_awareness_thesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.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 4

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_off000054bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54BD 4972 bytes
SHA-256: 531d43a02a40c2e54bac9162c63657f6fec8cd2899f093695bdbbbd60336f675
font_01_sfnt_off0000657f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657F 10704 bytes
SHA-256: 292ce683d45a43646c505af80823fda87b3440a74248f34e194de828edbcef28
font_02_sfnt_off00008a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A12 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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