Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd86c41cae0563…

MALICIOUS

PDF

52.4 KB Created: 2020-07-31 11:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d2433c4a8923344dbff72bc1bcf6598a SHA-1: 89dca469afe88414c65ad42e6fbe6823c293f353 SHA-256: 78bd86c41cae0563e868a74c0f659f69ca93cc2cc9cd2a407829ef7ea0ac222f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a redirector and part of a link farm. The embedded URLs suggest an attempt to lure users into downloading other PDFs, likely for malicious purposes.

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/pify?keyword=curso+de+econom%25C3%25ADa+moderna+samuelson+pdf In PDF document text
    • http://files.mountainridgefurniture.com/uploads/1/3/2/3/132303099/dazaradubakawipamen.pdfIn PDF document text
    • http://files.creative-change-management-online.com/uploads/1/3/1/3/131398236/8637420.pdfIn PDF document text
    • http://files.jonpearsonanalytics.com/uploads/1/3/1/4/131453996/0d16d5c73ec1e4.pdfIn PDF document text
    • http://files.ksetiya.net/uploads/1/3/1/6/131606720/7472566.pdfIn PDF document text
    • http://files.esperanzaxc.net/uploads/1/3/1/6/131606666/xiwomiwokokaf-junupuxowaw.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/1/0433/0687/7080/files/7074967355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/65349580322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/79790018618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/38842805707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/jazunimex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/20367370517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/85372511229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/tasagusokovufuzesejub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9036/8929/files/vejadenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/nejogididon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/doxabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3108/4701/files/fefugor.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 7

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_off000082cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 5132 bytes
SHA-256: 97108f57e93ba265dc07a94dcf32b27218352c72d265dd13adb54e78a490782e
font_01_sfnt_off00009429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9429 15276 bytes
SHA-256: 115da7eaa39a0ae5c5fa793aa8969881390363597bbad4570c819f446ed250d2

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