Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b662c31b8f2dd77…

MALICIOUS

PDF

34.3 KB Created: 2020-08-09 09:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c0b54934de9ea97a16f1b17f3bda46ba SHA-1: 7b81c40b89fa89aa938a9f33c3dc6986fa1ec876 SHA-256: 4b662c31b8f2dd77b201830223e6a20eec0a7fc9329b76e36cab453ecde09296
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Seismic design of steel structures mazzolani pdf' and the URL 'https://ttraff.ru/pify?keyword=seismic+design+of+steel+structures+mazzolani+pdf', suggesting a lure to download a PDF disguised as an academic document. No scripts were extracted from this sample.

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=seismic+design+of+steel+structures+mazzolani+pdf In PDF document text
    • http://files.baraniakenterprises.com/uploads/1/3/1/4/131453026/85126.pdfIn PDF document text
    • http://wowugawa.nolanwhitephotography.com/uploads/1/3/2/6/132696212/3fa6f15fe9b.pdfIn PDF document text
    • http://files.danarkelly.com/uploads/1/3/0/8/130873875/paguninifodopig-jekawigekilag.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/1/0434/1065/3338/files/64738773941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/duxonovinaruzuzatisaforof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/estrategias_aprendizaje_cooperativo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/xisij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/45581750968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/jamovodapikumaju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/21514218333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4999/2870/files/wild_horseradish_stardew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/71893376514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/oxford_english_grammar_book_for_class_3.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 1

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_off00004805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4805 5628 bytes
SHA-256: 7cb8580c4bd39ba2b08cc0607ac56d61012c230a4ac39cb41913124c4af6202b
font_01_sfnt_off00005b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B23 9744 bytes
SHA-256: 4052ae1ef7d1b9353a37f358e0b5b5a901f44991c4c998c298a17ade497074f5

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