Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdd0764f566df21…

MALICIOUS

PDF

41.4 KB Created: 2020-07-28 04:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d42370e10fbe3f93230691f8244c3a1b SHA-1: 73f718180e53c607f8dbc3890619c87c9f0e4822 SHA-256: 1cdd0764f566df2171fd2c4578578ab85c3811e6c4946970d1320ad47b6c841d
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link and a link farm, indicating an attempt to direct users to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational content ('Relative pronouns worksheet year 5'). The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further stages of an attack.

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.ru/pify?keyword=relative+pronouns+worksheet+year+5 In PDF document text
    • http://files.vandenbel.com/uploads/1/3/1/4/131406222/8212891.pdfIn PDF document text
    • http://files.thedragonslibrary.net/uploads/1/3/2/7/132712661/lupurixuvide.pdfIn PDF document text
    • http://files.dembrudders.com/uploads/1/3/2/6/132680908/2853493.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/1/0430/9850/5369/files/kogafakiwam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/solemevukebuziwirakogule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/54453835733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/benazinodivewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/rodutabizutuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/43155688481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/49512098342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/8192109605.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/tevuganefavefipogefil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/wilip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/xefepevigowijizat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/95076257303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/vewaxudozigowomoluvasuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/jivuxabibamerezijomegeku.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 2

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_off00006476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 5240 bytes
SHA-256: fea7b974deba19d13716d8444a1d15bebf6562d0587cfb571fe3124d6bd8c13c
font_01_sfnt_off0000765b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x765B 9968 bytes
SHA-256: 58e69a16251d93b3de4b9f02d2a58bf8936b80fa8a1a8cbd8b8a050e2d06346e

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