Malicious PDF — malware analysis report

Static analysis result for SHA-256 284cac10d7d62f2c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 14:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 77c5193cd101d8a5f5c6ac2df6d0df3d SHA-1: f7b30f1fc67a6f0abadb504bb586ad85b227f420 SHA-256: 284cac10d7d62f2c2f57a98670168d02347bdc82d6ad2edc3320ea990dcd4fce
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'number worksheets for preschoolers' and the malicious URL, suggesting a lure to trick users into clicking the link. The primary attack pattern involves redirecting users to malicious infrastructure.

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/pify?keyword=number+worksheets+for+preschoolers+pdf In PDF document text
    • http://files.appraisalprogroup.com/uploads/1/3/0/8/130813079/piwovonu.pdfIn PDF document text
    • http://files.maoriworks.com/uploads/1/3/1/1/131163705/8236603.pdfIn PDF document text
    • http://files.nzethnicwomen.org/uploads/1/3/0/8/130813738/d7aaddd383bca1.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/1/0431/3425/5265/files/17909643173.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/10561886636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/89211407098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/bikezoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7747/5233/files/alter_ego_a1_cahier_d_activits_corrige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/60536875272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/rixopitilit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/suxetixetagufelivid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/business_model_validation_what_makes_business_models_work.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC2 5176 bytes
SHA-256: cb0cc816fb4c3222d6fdb732758162d0ae562143404e3d9dee57ea57031a8b59
font_01_sfnt_off00007178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 10200 bytes
SHA-256: fa2d7fb8f83e35ef35da2eaf035a543581e7718644ff13eae9ceefdb0d045fe2
font_02_sfnt_off00009425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9425 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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