Malicious PDF — malware analysis report

Static analysis result for SHA-256 283a4ce3a59f876e…

MALICIOUS

PDF

44.1 KB Created: 2020-09-22 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03d907780ea25eafec8b10388b087bfa SHA-1: 094e04f4243096394986525c2ae6db0fdfd78cc6 SHA-256: 283a4ce3a59f876e1a5f8d35213e7ac684a53e9b620df4684c4d2a8cafb87216
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL that appears to be a lure for 'Kumon math level i answer book pdf', suggesting a phishing or scam attempt. The presence of numerous embedded links, including one pointing to a known malicious redirector, strongly indicates an attempt to lead users to harmful content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=kumon+math+level+i+answer+book+pdf In PDF document text
    • http://ruzixel.tikicab.com/uploads/1/3/1/1/131164250/sijiwitevadiruleti.pdfIn PDF document text
    • http://xawevakow.krmcloughlin.com/uploads/1/3/0/7/130776553/f691bf0.pdfIn PDF document text
    • http://moxasozu.remycenard.com/uploads/1/3/2/8/132814930/nedojumutoxevoda.pdfIn PDF document text
    • http://files.gelardivineyard.com/uploads/1/3/0/7/130739084/mivalagibiro_gegedaxa_mibutijud_takerakiw.pdfIn PDF document text
    • http://zutato.burrenarchery.com/uploads/1/3/0/7/130775727/2cf57c818186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d09fda7-7be4-42f6-a4a1-9a89945ef877.filesusr.com/ugd/1f6d71_b215fbb4ab0f4469896922f1a3731674.pdf?index=trueIn PDF document text
    • https://970e3f99-6083-47c6-9501-0bbcd63bd6cc.filesusr.com/ugd/6166c9_71f0bf4db6974590bb6b4990720fecfb.pdf?index=trueIn PDF document text
    • https://2a1a596c-6db1-4088-8ea1-33bfdd57a1f5.filesusr.com/ugd/e23fbb_038758f12855415c98e475ae8a4398c2.pdf?index=trueIn PDF document text
    • https://8ba6d507-1d0a-43c7-ae45-ecee33610579.filesusr.com/ugd/0af078_f32b04fad44e4be68e12f708deaa7e2e.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/keep_talking_and_nobody_explodes_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7352/8223/files/29399296400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/88884325719.pdfIn PDF document text
    • https://1c4a9a57-f2b2-41c7-b697-a7644bad60e9.filesusr.com/ugd/ca32a8_63c38f8e6281490589b8e4011be67701.pdf?index=trueIn PDF document text
    • https://d2ef42aa-58dd-4908-9f29-5ea42e835691.filesusr.com/ugd/d7c203_39e5a07319fa404690ff8af21b9ca3c0.pdf?index=trueIn 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 4

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_off00006842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 5604 bytes
SHA-256: f94786f07d654dc1eb020e3b71116edc87c04bd21149aacf4377012b3d8ea587
font_01_sfnt_off00007b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 12804 bytes
SHA-256: 1493ad6b5a96b7b644ae3a3eae091b8acca7be51a9c0d13fe85df527d82a3b9b

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