Malicious PDF — malware analysis report

Static analysis result for SHA-256 53573092cfe7a6af…

MALICIOUS

PDF

37.3 KB Created: 2020-07-29 22:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2fd0e3faefc36429a5ae6026c01f51dd SHA-1: bed982fb04eb45b220af539a8cd217573a62d033 SHA-256: 53573092cfe7a6af7613287ab120a33a71d07c50f269aae42da27bbe6bae9221
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure for a 'workbook pdf free download'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=new+cutting+edge+elementary+workbook+pdf+free+download In PDF document text
    • http://files.maplerunfriends.com/uploads/1/3/2/7/132710630/kubaguzeziku_xuwemorefep.pdfIn PDF document text
    • http://files.corehealthbemidji.com/uploads/1/3/1/4/131437765/a9723165e6992d.pdfIn PDF document text
    • http://files.louisefutchertherapy.co.uk/uploads/1/3/1/3/131398547/1155303.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/1/0432/5680/7586/files/18766801893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/fesiponoxixaperibeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/fizapegowidew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/xelabapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/mavizusumef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/565992157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/rebetimepafuzosar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/piwaronudimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/defutapuxeluwiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/disus.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_off00005602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5602 5548 bytes
SHA-256: fc7d7e538fd76d08e4e148d496b0d37ecd7dc6deea59ad87762ecc47604902e4
font_01_sfnt_off000068db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DB 9092 bytes
SHA-256: 8bd460ea8c2d1483588ec499867861cd71cda81190400d0af3aa63eeda4b8c17

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