Malicious PDF — malware analysis report

Static analysis result for SHA-256 b581583e2c12cfda…

MALICIOUS

PDF

34.2 KB Created: 2020-08-02 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1dd277528887c713870a653ee5fc3fb0 SHA-1: 60321d8ce45cc437727435e4adb87a47328be8c8 SHA-256: b581583e2c12cfdaefd10f1d85421e34cbcc3a8cb6d85df9eb54fd3919d83ebb
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure, and another flagged a link farm pattern. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a lure to malicious sites.

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=doing+ethics+lewis+vaughn+pdf In PDF document text
    • http://files.anniepaquetteart.com/uploads/1/3/1/6/131606815/5388510.pdfIn PDF document text
    • http://files.lorimerconsulting.co.uk/uploads/1/3/1/0/131070375/5292360.pdfIn PDF document text
    • http://files.bobbieeisenstock.com/uploads/1/3/1/4/131408581/gitifosevunata.pdfIn PDF document text
    • http://files.faithlosgatos.org/uploads/1/3/1/4/131411857/3dea4.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/1/0431/6761/3087/files/volts_server_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/21383957924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/63685490014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/73437163407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/xejeluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/dusuluxirajipar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/dureliganesojodiriluv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/bunopolananunibexoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/70012703851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/xodusokozob.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
🗂 Part of campaign: faithlosgatos.org 4 samples

Related samples 7

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_off00004737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4737 5472 bytes
SHA-256: 54e4f694c07ab7b78fa29c006537db489c74ffacc8167d01de1c2ed56f74bcc8
font_01_sfnt_off000059ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FF 9940 bytes
SHA-256: 40dcbf44dcf8cf5cd69b5976a381ca9d77f4f103ce95f8c1aff90e4f3666011a

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