Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef67ad8eb072901c…

MALICIOUS

PDF

35.6 KB Created: 2020-08-06 06:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0ac9e0ebdadc8a11a7ec67f264e7c08 SHA-1: 27762bbd5a743493d6265a60bf73844b8baf4e26 SHA-256: ef67ad8eb072901cc2a93e87dc62c1c054643415cafd07ab59eeaf04de40037f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links designed to create an SEO link farm, with a primary redirector pointing to malicious infrastructure. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users into clicking it for a fake download. The ML classifier strongly indicated 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=physical+science+textbook+pdf+grade+12 In PDF document text
    • http://files.wanderlustnwcatering.com/uploads/1/3/1/4/131452800/dimawavabobuxida.pdfIn PDF document text
    • http://files.karrynargus.com/uploads/1/3/1/4/131438137/2320517.pdfIn PDF document text
    • http://files.michellejnettles.com/uploads/1/3/1/8/131871762/gemifub.pdfIn PDF document text
    • http://files.johngreinerferrisstudio.com/uploads/1/3/2/8/132815343/6302219.pdfIn PDF document text
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.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/1/0428/9468/8419/files/writing_a_job_application_letter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/rugodelem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/weleje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6601/5395/files/bopiwuturixuxip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/27872501340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/befevavusaxigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/kuvojotatalitaxakigajib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/laravel_password_reset.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/crash_jerry_spinelli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/tipowapiveb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3071/6314/files/interview_zen_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/92984947795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/venowozakitov.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_off00004c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C3D 5976 bytes
SHA-256: 74541c3d01c80658316e1bf470dc1476c687c1dfb041a425503208142f2c575e
font_01_sfnt_off000060a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A1 9596 bytes
SHA-256: 6d25a0f35694bf3e7fb0b3ac08240ae06c3f7e18caa6bee43056a5bd85402487

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