Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a3dbcaf8ed6db4…

MALICIOUS

PDF

45.2 KB Created: 2020-07-31 12:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9ff74a1bfd08b134bd43a88ca5e9d2c3 SHA-1: d5bf77a5171fb4ea5cefa651800c7ba1b4241920 SHA-256: f4a3dbcaf8ed6db4cda60578367993898537b832b920db2fd840fa2ee4a7108e
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The primary attack pattern involves luring users through these links, with the ultimate goal likely being credential harvesting or malware delivery.

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=punctuation+rules+worksheets+pdf In PDF document text
    • http://files.smenard100.com/uploads/1/3/0/7/130739387/440557.pdfIn PDF document text
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdfIn PDF document text
    • http://files.michaeljamesoberhauser.com/uploads/1/3/1/1/131163705/9294753.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/1/0428/9386/9223/files/daxata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/gibomiboxawifed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/kobujelewezezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/93867959982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/benofatipazad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/17041547609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/36201286476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/72466341373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/95480833103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/simunavujijumuj.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_off0000728a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 5284 bytes
SHA-256: a13caad6148dc6142914365510451401dbfa2e3e2f4b99794120c0093bec9964
font_01_sfnt_off00008481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8481 10544 bytes
SHA-256: cc5ffdbd88bb7b86bde4282657e9ad458f199fb9ec9345a5ce2801a96444c9f0

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