Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9a63e80359473…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 09:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b2247a6552a0ac61b688d6d774f563a2 SHA-1: a3129dcb4f759d5447977d224dde8e7581cb053e SHA-256: c8b9a63e80359473c1dc00c05b1242e2cb22b9fd02a83abb64d26782002bf82b
194 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including one that redirects to known malicious infrastructure. The primary lure appears to be "cervical stretching exercises pdf", which is used in the malicious redirector URL. The document body is heavily obfuscated and contains a URL that is also present in the link farm. The ML classifier strongly indicates maliciousness.

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=cervical+stretching+exercises+pdf In PDF document text
    • http://files.thepurposedathlete.com/uploads/1/3/0/8/130813395/8dcb9c2f3fad.pdfIn PDF document text
    • http://files.nexusdesign.co/uploads/1/3/0/7/130776769/likekovuwis_kavukade_lekodunir_jajenekojivodo.pdfIn PDF document text
    • http://files.michellescreations.shop/uploads/1/3/2/6/132682883/bf45856104.pdfIn PDF document text
    • http://files.jose-figueroa.com/uploads/1/3/1/3/131382395/0bdb7.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/1/0432/5706/9721/files/72724711611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/rs_aggarwal_reasoning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/nakufinipejepuruxudan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/beserugixapam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/73901590698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/59365091296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/the_art_of_living_book_epictetus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/1698121835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/2108/7398/files/alphabet_worksheets_preschool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/wuzavaporitifaxono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/27992120949.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_off0000616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5448 bytes
SHA-256: 820a64303e3e65d0d73ddd8ae81003c0d11326e44981c1f12a98fbeee6319b4e
font_01_sfnt_off000073fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10704 bytes
SHA-256: 3216393ff6219d3f7b4735d85c2bb4ec87409409202f0917aac5b88b1464105f

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