Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ce823b2f9cf90…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f57cabc9c193aec330b637d134c6a2e9 SHA-1: 322d4e654a2f9015ea453f622eb4be5a4b115c2a SHA-256: 553ce823b2f9cf908931e34fe2f14e92edc7a0892d8d328d37f071b5cdf1fa48
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Patient. co. uk gout diet sheet' and the malicious URL, suggesting a lure to a health-related scam. The presence of a link farm indicates an attempt to distribute malicious content broadly.

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.com/pify?keyword=patient.+co.+uk+gout+diet+sheet In PDF document text
    • http://sates.rusticcandlecompany.com/uploads/1/3/1/4/131408791/16483.pdfIn PDF document text
    • http://files.trchurchofchristcourses.com/uploads/1/3/1/3/131379740/4249720b7a7.pdfIn PDF document text
    • http://ledomojun.powersourcedubai.com/uploads/1/3/0/8/130813714/lifelonug-palobatumonarad-narerogat.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/1/0432/0457/5387/files/jikafupiluxejevub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1714/2433/files/14295775781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/85330166563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/64413019398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/adventure_story_books_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/bizzy_bone_carbon_monoxide_full_album.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/23827797038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/periodic_table_with_atomic_number_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/wow_classic_miner_s_fortune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/67251345454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2546/6279/files/79109059712.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 6

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_off000064ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EF 5172 bytes
SHA-256: 0bac814a2df74f413b90e2222552075bca70d48b61cceff6b784a75827251c76
font_01_sfnt_off00007683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 10440 bytes
SHA-256: 6c4a1ed3b6b34f4708502cce56fe9d36665ffe61183ba6fa6bcd784731dae21d

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