Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31545f44f549ffe…

MALICIOUS

PDF

47.7 KB Created: 2020-08-04 20:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f240e7d65e8c173895e309a3e4e560dc SHA-1: 66f28d7ee2ec8802b69a5678b4f35a33fd651e8f SHA-256: c31545f44f549ffe70f70652c32705839fb0fa4ac3b0b48786e2fb3e8c2ec6ce
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and being part of a link farm. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. This suggests the PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

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.cc/pify?keyword=factores+bioticos+y+abioticos+de+un+ecosistema+acuatico+pdf In PDF document text
    • http://wabufos.emshannonart.com/uploads/1/3/0/7/130775195/3287407.pdfIn PDF document text
    • http://files.joyfulljoyfull.net/uploads/1/3/1/8/131871424/lamadege-namutin-sezudunapomuxe-nudanuvodebu.pdfIn PDF document text
    • http://files.shaftesburyyoungpeople.org/uploads/1/3/1/4/131452988/8587589.pdfIn PDF document text
    • http://files.homesteadfamilygrain.org/uploads/1/3/0/8/130873718/nekipajekokureg-dijudisevane-letenevotado.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/1/0433/8640/5022/files/luxonupito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/94136131139.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/ranoxasudikekizipexaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/2102472718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/70694954919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/ropasizanuxovorazubifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/lepalexitekufuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/puzasimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/lomufepizegugoxirepawajor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/93070142740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/garalufijem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/kuruniwa.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 3

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_off000078fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FE 5468 bytes
SHA-256: 2b5b5ab71e34b9f9ff24d02202809bccdd0a41309ac45f839d4558a28f1992b5
font_01_sfnt_off00008b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 11004 bytes
SHA-256: ea31bb4e4caec57f6cd7d539afd835f5776d8bdcfc0bda9fb67c0c3fc94a04f4

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