Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43440f14ab82553…

MALICIOUS

PDF

69.4 KB Created: 2020-08-14 19:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5bb8864eff375f37a0346bb6cb7a0641 SHA-1: 653199d5db33db12f7f5820afde0a5c54acefa9e SHA-256: c43440f14ab8255374ea6deea84683032e5b26d69df7aca1eed1bb90126b1ef5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this heuristic. The presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.com/wb?keyword=osteologia%20y%20odontologia%20forense%20pdf In PDF document text
    • http://files.ladyvetanimalhospital.com/uploads/1/3/2/8/132814166/gekom.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/1/0431/0692/6754/files/38204669301.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/anatomy_and_physiology_workbook_for_dummies_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4901/5706/files/4172189588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/how_stress_affects_mental_health.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/lasedifelegudulesajexik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/jigabufezawiroro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/21593908222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3504/1685/files/rivolevezoles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1379/9064/files/35100419777.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 1

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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 5336 bytes
SHA-256: 01bc2382f9b852a6498b17037bdc4ea0241978eb51bae89241ff751f6e4be4a9
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10008 bytes
SHA-256: 8fcc33a7ea52c950b2b0d2e4a24b009e0d00620a76c2f55065a53cac2762c85f

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