Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c413f4963556c92…

MALICIOUS

PDF

44.9 KB Created: 2020-08-05 03:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4b2c872ac217c2b231822353e57f2ce1 SHA-1: 1914e703649f8ad6fb0fa4e3a78ba18e2a402037 SHA-256: 4c413f4963556c92bcd5f1a8f69fba96c3e9215d79b4b0e3386f800b24c94980
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 links, many of which point to a redirector service. The document body, though partially corrupted, includes text related to 'Types of audio amplifiers pdf' and the malicious URL, suggesting a lure to a potentially harmful site. The primary heuristic indicates the PDF links to known malicious redirector 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=types+of+audio+amplifiers+pdf In PDF document text
    • http://files.dhsupwardbound.com/uploads/1/3/1/6/131637316/a29d3a020af56.pdfIn PDF document text
    • http://files.peacelutheranandover.com/uploads/1/3/1/6/131637271/5035790.pdfIn PDF document text
    • http://files.pkpressurekleeninc.com/uploads/1/3/1/4/131455475/283639.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/1/0438/8116/9051/files/51739511104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/dark_cloud_2_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/addition_and_subtraction_worksheets_grade_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/vabepazupuzinum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/biological_science_freeman_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/screwtape_letters_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/18591576478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/acta_constitutiva_de_sociedad_mercantil_mexicana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/castle_crashers_industrial_castle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/99458979723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/linux_setup_virtualenv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/43908184471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/narakekakad.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
🗂 Part of campaign: pkpressurekleeninc.com 6 samples

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_off00007321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 5236 bytes
SHA-256: 61b66aec56c2a5f6b997a72fb24f899962c406cd5f22a376b6fa5f060664b29d
font_01_sfnt_off000084e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E5 9992 bytes
SHA-256: 2bcafd8c3fe7cdaad3db8091a3fa5a16d35ea580bf42850dfb85ceed755f47cb

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