Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43739e57fbb2838…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 17:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc90a44faaa9df9e3f7fc4f932292b8a SHA-1: 4513d1eab86b24c2958a877c452e95dd1ac4fca2 SHA-256: e43739e57fbb28380d6ebec16c1233f5f547147cbf24e86206c1dc979ee2c750
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary redirector URL being https://ttraff.ru/wb?keyword=doing%20good%20better%20pdf%20download. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's a lure document rather than legitimate content.

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=doing%20good%20better%20pdf%20download In PDF document text
    • http://files.adventure-and-salt.com/uploads/1/3/1/3/131380966/tazesivunuwirer.pdfIn PDF document text
    • http://files.mestizostacos.com/uploads/1/3/0/7/130739817/pavipelerakadunur.pdfIn PDF document text
    • http://files.grassyknollfarm.com/uploads/1/3/1/0/131069906/e793257e4f736.pdfIn PDF document text
    • http://files.hannanicholeart.com/uploads/1/3/0/7/130738960/6653945.pdfIn PDF document text
    • http://jewasi.mentes-en-transicion.com/uploads/1/3/2/6/132695569/negenonimalalenam.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/1/0428/8105/6935/files/58574610708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9518/6851/files/92922655535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/87056231535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1800/9251/files/nukezemup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/kunujojilapovalod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/tawevinujadafekufazenoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/scope_of_business_law.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/sebokitimebitufibuzuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/96647350098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9277/8901/files/52271444746.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_off00007df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF5 5260 bytes
SHA-256: 5802c9891712b66f1b6cbab42b0370230039630b3d43660751703dc87e7599cc
font_01_sfnt_off00008ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFE 10312 bytes
SHA-256: 32d496c320819a1c2d9745ad4c7a4d4ac1b1fb89bf71c7a415612670819c632d

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