Malicious PDF — malware analysis report

Static analysis result for SHA-256 8527f1362096e931…

MALICIOUS

PDF

36.5 KB Created: 2020-09-16 15:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0262aa09570982576b441f49b4a50282 SHA-1: 9ad3f8f4e60f625101ec765df5ac40bdb690eeb6 SHA-256: 8527f1362096e931e9716d0ad1534ef0ebdfd9c69fbdf5a22a7891d317e2ef75
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests an attempt to lead the user to a malicious site.

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/wix?keyword=barn+door+floor+guide+wall+mount In PDF document text
    • http://files.thecrossingsgahanna.org/uploads/1/3/1/3/131379113/dujinunorux.pdfIn PDF document text
    • http://files.sfautismsociety.org/uploads/1/3/0/7/130739315/54d8eb1e7795.pdfIn PDF document text
    • http://files.thecoastaldisplay.com/uploads/1/3/2/8/132814123/jaked.pdfIn PDF document text
    • http://files.calvinsmiththerapy.com/uploads/1/3/0/7/130776255/zovupexo.pdfIn PDF document text
    • http://files.fauquiercommunityband.com/uploads/1/3/1/3/131380966/redovagekos-kofagid-nobesurosozo-rafisarepamidi.pdfIn PDF document text
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdfIn PDF document text
    • http://kilezul.cafecesura.com/uploads/1/3/0/8/130874601/3625273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b0f580-7324-4008-b020-8c91e79fbd4a.filesusr.com/ugd/01bc73_e125b248a4d24db6a67e869d4d8be3ef.pdf?index=trueIn PDF document text
    • https://5b0d4871-392e-4a1b-a071-73302b1174f5.filesusr.com/ugd/b56239_e3d1daeda039498b93b6d452e4c58090.pdf?index=trueIn PDF document text
    • https://c7ff36f9-5fc5-4258-9bfe-08a20dceba3b.filesusr.com/ugd/3ed902_13864a639fcd4d019f28bed0ddd11315.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/69937915735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6826/3062/files/rolaxefupem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6683/2534/files/78798025791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/calathea_care_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/intranet_and_extranet.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_off000051c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C5 5192 bytes
SHA-256: d2c35dca819f541a168bc23800ef6e104b1ba64d21bf95f004075d8bf1db819e
font_01_sfnt_off0000636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636E 9896 bytes
SHA-256: 4b2633eaf093641acb54ed0cf0f3877bcc8897e02cfd93600b34bccf2537ff88

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