Malicious PDF — malware analysis report

Static analysis result for SHA-256 53763d5dd7508145…

MALICIOUS

PDF

37.5 KB Created: 2020-08-14 20:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e18579abcab618c6f62d4c07e53d6bfc SHA-1: 90cea8b18fdd56eff3c4721ad688f17cee4adc10 SHA-256: 53763d5dd75081458e9d938066db7836943ff5081cb64a981631c98db49100a0
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing for a PDF link farm. One of the primary URLs, 'https://ttraff.ru/wb?keyword=world%20war%20ii%20timeline%20worksheet', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users to malicious infrastructure. No scripts were extracted, limiting the analysis of direct payload execution.

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/wb?keyword=world%20war%20ii%20timeline%20worksheet In PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://files.nutritioncapecod.com/uploads/1/3/0/7/130775728/tiresuze.pdfIn PDF document text
    • http://files.brooksidechiropracticcare.com/uploads/1/3/0/8/130874134/jaxukumokatafanunogu.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/1/0435/9972/4702/files/nituzofatuxotid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/jifite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/possessive_adjectives_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/rowonurexusufapofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6642/4477/files/mulojeziwilejuxotitip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/caravan_palace_lone_digger_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8889/5386/files/fopuverevidoxatubutowulir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/cbse_class_10_sample_paper_2020_20_with_solution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/59314592328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.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_off000055dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55DD 5232 bytes
SHA-256: 82a3e509dade0accf742f752f0ef77ddc19cf260649c5eb18bc050ca4f0cc601
font_01_sfnt_off00006796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6796 9876 bytes
SHA-256: d55800c3146890454a85a1a176a88f1934b6c675087ed6ed0840931bce1ac268

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