Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc4a4eeefc21174…

MALICIOUS

PDF

60.4 KB Created: 2020-08-14 05:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 11a4e35c2c7e58a26d2052b95f11535e SHA-1: 2481c271e92350957994d7038380f929fe3c7f9b SHA-256: 4dc4a4eeefc21174178c1d1e925a1d45e95ed46fdd3da55897b9004e0a3306fd
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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.cc/wb?keyword=skoda%20amundsen%20manual In PDF document text
    • http://files.royscopies.com/uploads/1/3/1/4/131437655/2004657.pdfIn PDF document text
    • http://mofife.brendathebeauabstracts.com/uploads/1/3/1/6/131637254/zisaguworobawu.pdfIn PDF document text
    • http://files.rhythmresearchresources.net/uploads/1/3/1/6/131606127/gelizoxi-mevep-xuzumifam.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0431/5453/8656/files/oovoo_invisible_detector.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3687/6706/files/kofadasokivefaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/newar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9444/9055/files/holt_mcdougal_chemistry_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/panurufevini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/treatment_of_gestational_diabetes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/58660868292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/17853157190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/82132451402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF8 5568 bytes
SHA-256: d55bbfcdb8e081f7a1cbd6a5303cf9e0a2c0fda4005a2d7527472d5191d07754
font_01_sfnt_off0000a1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AC 5044 bytes
SHA-256: 6d1bb5bee2310ea89f4879f435c1f75a0a98251dfe605e0c00394aa24ad02596
font_02_sfnt_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 15852 bytes
SHA-256: f7a7b9d71b1e134f00b83cf8aff08d83bcbabe47a44fa418bc703f7c05864684

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