Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c652eacd0838e9b…

MALICIOUS

PDF

42.6 KB Created: 2020-08-10 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7551dd65117728b6579fd81b015d513e SHA-1: 4df9c7b885a96d9898e4488824a4a5beca3cdfda SHA-256: 8c652eacd0838e9b40ae29895a1cc3ec9e979bf33c9f4d16cf16ee637785ec76
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The primary malicious IOC is the redirector URL.

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=critical+care+nursing+textbook+pdf In PDF document text
    • http://minava.normanmuseum.org/uploads/1/3/2/7/132741099/3792983.pdfIn PDF document text
    • http://files.frenchreproduction.com/uploads/1/3/0/7/130775402/pebivipaw.pdfIn PDF document text
    • http://files.kmrice.com/uploads/1/3/1/8/131858661/padabebe_defulelusexi_kanojavaku.pdfIn PDF document text
    • http://files.erichreimer.com/uploads/1/3/2/6/132695714/6c9ce3.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/1/0433/0687/7080/files/52945462890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2102/files/python_directory_exists.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/bakunin_libros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30698029692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/wexukugelaxowulomolodaxon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/understanding_pathophysiology_canadian_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/zojififexadamileruwid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/25260323717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/lowamibijixasavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/luromi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xadexuwewipibiduba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC1 3304 bytes
SHA-256: 7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559
font_01_sfnt_off000067a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A6 5500 bytes
SHA-256: 5974d54e4267d4658bc281557ddfe717a39fe2beda2a32a17f2b7ad27b7f1973
font_02_sfnt_off00007a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 10200 bytes
SHA-256: 381bcdf3e3d50a5048f8fc5e91b3649d013eb977a621e97db4391b0264f5f824

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