Malicious PDF — malware analysis report

Static analysis result for SHA-256 21551d6045984ee3…

MALICIOUS

PDF

44.6 KB Created: 2020-08-16 15:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 446e6d4e0fe712c9b87838779c8e77c6 SHA-1: 19e152e4bbf533fa5aacec44d92b7232617b4716 SHA-256: 21551d6045984ee3127aae89b603a76d5575f0b25d7fb9bdea5e4a9ffa5e2828
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm, likely for SEO manipulation or to distribute malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further stages of an attack. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=super+duplex+stainless+steel+sheet In PDF document text
    • http://files.misssantafe.org/uploads/1/3/1/1/131164476/darifiladekax.pdfIn PDF document text
    • http://files.wellnessbyoluchi.com/uploads/1/3/2/6/132682063/masegivexuzijimiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/base64_image_decoder_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/redabiravek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/xenigitegijepole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/20317001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/age_of_empires_3_strategy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/79168106327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/44872097886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8830/5575/files/67958584343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/97699810845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/20272027882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/architecture_plan_symbols.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/56417498750.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 3

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_off000063a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 4992 bytes
SHA-256: b90cb96929e9431b3d9233497aaa5832dd2ee958845be07231f781fb3f3999eb
font_01_sfnt_off0000748c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 10144 bytes
SHA-256: cad13768271132b40cd0c8b804ef62cbf76a6d7c1f522e8699911eef4365299f
font_02_sfnt_off00009759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9759 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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