Malicious PDF — malware analysis report

Static analysis result for SHA-256 255a2188acca8c8c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 05:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b0e37364f40454374055c3481aec1b5a SHA-1: 43c55db9ae28e65703f461ee1b893531e0c17fd1 SHA-256: 255a2188acca8c8c9dc632aef39ddf5c6fb3af23eacb335f235f07e3661c46c2
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains a redirector link to a known malicious infrastructure. Additionally, it features a large number of embedded external links, characteristic of a link farm designed to distribute malicious content. The primary malicious IOC is the redirector URL, which likely serves as the initial point of contact for further malicious activity.

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=splash+screen+library+android In PDF document text
    • http://files.laurabreaux.net/uploads/1/3/2/3/132303388/rodumadibupedok.pdfIn PDF document text
    • http://files.redmousedesigns.com/uploads/1/3/1/4/131438823/pewigu.pdfIn PDF document text
    • http://files.vk5pas.com/uploads/1/3/0/7/130739028/pamav.pdfIn PDF document text
    • http://files.sacredheartsisters.org/uploads/1/3/0/8/130874599/82ba8ce33bb39.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/1/0432/5313/7576/files/65209584580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/1494218049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/dojukunufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/hp_4500_printer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/46113300806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/madukamamemoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/60873199508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/69799790755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/dabonivepeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/mbdgo_full_form_medical.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/career_development_strategies.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 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_off00005fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 5508 bytes
SHA-256: f0d27176ba78976de77d01cdeb6504d9333e29e80f90158fb7bedb2232d4341a
font_01_sfnt_off0000727f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 10748 bytes
SHA-256: b0294bbf78c9d7081860896835b9c22e03408e4fdc3d051a3f214d7e2c844bef

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