Malicious PDF — malware analysis report

Static analysis result for SHA-256 5997d57f72b7add7…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 20:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 25ddae233e55aa6d27f7ee3b88af4a3d SHA-1: 1e6fc9c74f622433ef184be8f32aba9788d01863 SHA-256: 5997d57f72b7add7c934f35e636a295059c98d5a3c1bed05b2795c71f8b295af
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to malicious infrastructure. The ML classifier also 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/wb?keyword=alle%20dur%20und%20moll%20tonleitern%20pdf In PDF document text
    • http://files.crossfitunsung.com/uploads/1/3/0/7/130776363/03d1912de6.pdfIn PDF document text
    • http://ponejabes.thinkinenglish.org/uploads/1/3/0/8/130874038/kokawodus.pdfIn PDF document text
    • http://files.uuchurchofstockton.org/uploads/1/3/1/3/131383544/3310012.pdfIn PDF document text
    • http://nufivatik.costumesandembroidery.com/uploads/1/3/1/6/131637419/7d7ca36f8789.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/1/0437/4603/3818/files/77869433798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/tar_residential_lease_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3841/6801/files/nekiwegakegawikisupawiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3427/4966/files/puxamuvodofuxobevojiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/poe_flask_recipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7358/4793/files/jepitukapis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/smoothie_recipes_south_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/libro_monedas_y_billetes_de_colombia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/jovatajejofifijojukupufal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/77556323876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2177/7570/files/7814896885.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_off00005eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEA 4788 bytes
SHA-256: c79f286430eef2bc7217e3d9c101e07f510f2629e36ed58a3e2b8df6be1be441
font_01_sfnt_off00006f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 11056 bytes
SHA-256: 120e5c9ee25b4373df780bf0beab88282555b9dd9891c677c1e12837a5d3f44c

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