Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257e540518ef313…

MALICIOUS

PDF

39.9 KB Created: 2020-08-07 19:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a563bfd8e9fcbde0aa8e645a1d247165 SHA-1: bf63d073e7e3793d5c7a4f9b2a28cd5e9336a892 SHA-256: 4257e540518ef313947b970a0283160d72e5e81f4f077695de3c27ae22f73787
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO poisoning. One prominent link directs to a known malicious redirector at 'https://ttraff.ru/wb?keyword=duties%20and%20responsibilities%20of%20an%20administrator%20pdf'. This suggests the document is designed to lure users to malicious infrastructure under the guise of providing information.

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/wb?keyword=duties%20and%20responsibilities%20of%20an%20administrator%20pdf In PDF document text
    • http://files.gugulethusiziba.org/uploads/1/3/1/3/131381021/3349453.pdfIn PDF document text
    • http://files.falkland.org/uploads/1/3/1/4/131452733/tawerewatozo_xatironexaw_vofil_detalefoborutiv.pdfIn PDF document text
    • http://files.wastegyalstyles.com/uploads/1/3/0/8/130814126/wumujod-jewisomebenumad.pdfIn PDF document text
    • http://files.techknowhawaii.com/uploads/1/3/1/6/131606694/zunebomuvu.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/1/0434/0980/1365/files/wekisesojetubawapareberu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7266/7296/files/pdf_merge_tool_mac_os_x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/8th_grade_life_science_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/9119/2985/files/alkaline_food_recipes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2169/6149/files/why_are_steam_downloads_so_slow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/21074560920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/15185059489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/5913/7951/files/conflitos_no_ambiente_de_trabalho.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/77549058435.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 5

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_off00005e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 5324 bytes
SHA-256: c92fab3e942ae303ebd796e58a5a8c8907c6777d9407f024a99f3407c1e8a065
font_01_sfnt_off0000707b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 10008 bytes
SHA-256: 9b41d97a41c143ed0356ed4fc891ce341dca36287c41f69d76ecb7e5700b4d50

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