Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b564d51dd89ad4e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 08:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1845fe6b6e0048ac5a8d2db148733f95 SHA-1: 7bb161516a24561bc0dbeb90f8478f2718a0a43c SHA-256: 8b564d51dd89ad4edf1cd303dc5474f5865a8a6dfcff4e9cac6e53eaa2e0f68e
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=color+by+letter+worksheets+for+kindergarten+pdf, which is likely used to redirect users to further malicious content. The document body and embedded links suggest a lure related to educational worksheets, a common tactic for phishing or malware distribution.

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=color+by+letter+worksheets+for+kindergarten+pdf In PDF document text
    • http://files.sbt-c.com/uploads/1/3/1/0/131071167/dea05a5a3.pdfIn PDF document text
    • http://files.saintjohnparishmorden.org/uploads/1/3/0/8/130874416/kodizilinabiwewu.pdfIn PDF document text
    • http://files.castletonkids.com/uploads/1/3/0/7/130776619/dosozilobukip-koxogukajej-numaxulaxelenib-basutitiwotigo.pdfIn PDF document text
    • http://files.lisamccafferty.com/uploads/1/3/1/3/131383664/bamibitamurata.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/1/0436/6965/1609/files/xununakunumomamebiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/mebizisezarifubiwibej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/98999401694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/hafele_hardware_catalogue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/62451138185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/irs_enrolled_agent_exam_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kawovuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/1454866759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/new_english_file_intermediate.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_off000063af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AF 5608 bytes
SHA-256: bb04e978b9692044ed48f46c30e3fbe8ebca28bfea5dae6227d8d43631620893
font_01_sfnt_off000076d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D6 10132 bytes
SHA-256: 0fab49ebefe21040f80552d10671cb4f322500ccb83596eeb1b3a418edae4096

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