Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351e0ce9d4f3028…

MALICIOUS

PDF

49.4 KB Created: 2020-07-23 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 31af62d60c43be7ee1c48b4063b711d7 SHA-1: 0deab55c26b59b9b2b3df38384511e7e7913ac26 SHA-256: 4351e0ce9d4f30289c6555c2d3dab704b602cca4fad9247a1861c1e6199612d5
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'ruby programming language pdf', suggesting a lure.

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.com/pify?keyword=learn+ruby+programming+language+pdf In PDF document text
    • http://files.teamhmac.com/uploads/1/3/2/3/132303320/5939541.pdfIn PDF document text
    • http://files.cloudvalleycashmere.com/uploads/1/3/1/4/131453213/fenidakegezasax.pdfIn PDF document text
    • http://files.treehousehashomes.com/uploads/1/3/0/7/130739780/38f88c6b4b.pdfIn PDF document text
    • http://files.fhsroarstore.com/uploads/1/3/0/8/130874613/eaf281.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/1/0433/3407/4523/files/xijaxakaliwafebaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4646/1852/files/tejun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/12825950896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/gapaxedibarosomikuvidir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/2027042685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/kegipawalodexosizixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/xoregasukokavoloxubobufit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/29556257880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/derarok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/renokerubojetemiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/15834788230.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6786/6265/files/75579848271.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_off000082b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 5168 bytes
SHA-256: 7e6e3de2750fb198b1ca10c738dc1613d5eab6cf633e3661fdbe7f7e730f2c43
font_01_sfnt_off0000942a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x942A 10548 bytes
SHA-256: b09680d4a4e776c466e4d973e5bfd178947acde37c07299aced3cc972a8dee45

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