Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec271b1b14f6bb3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 481093856cd06b43686060b5763163de SHA-1: 911f8a5d02b20a4ce69586e2753748051299c5ee SHA-256: 4ec271b1b14f6bb33d8ca6c4ce2720a5e8be2e77df5045061667d04fd6dea522
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'basic math placement test pdf'. This link likely leads to a malicious site or further download. The presence of a large number of SEO-optimized PDF links suggests a link farm or content stuffing technique to improve search engine visibility for malicious content.

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/wb?keyword=basic%20math%20placement%20test%20pdf In PDF document text
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdfIn PDF document text
    • http://files.christinamariecaruso.com/uploads/1/3/2/6/132696483/2019187.pdfIn PDF document text
    • http://vibux.southcoastdesign.co.uk/uploads/1/3/1/3/131381464/bf98023e8c.pdfIn PDF document text
    • http://files.judyatraveny.com/uploads/1/3/0/9/130969472/vutuzu-guxefavomowix-gemoretisuxevo-kekoxuranu.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/1/0429/7087/4009/files/sazetatepadutunujutineg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/kedoletuxolulefivugaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/the_analysis_of_biological_data_second_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/gifiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/50198309466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8516/7766/files/duxilenunuzazamonadilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/67932984060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/basic_korean_language_learning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/liduwikinanexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/lajepomoromapometula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/73497358106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/xirozizigasadujaxiwogunu.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_off00006c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5348 bytes
SHA-256: a366f63f80ef377f5b61b14d35cb60fdacd8e94410cc75b655b1591cc78b9e8d
font_01_sfnt_off00007e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E43 10140 bytes
SHA-256: e36cf0ef3545e4eede9562a1de7924428e3ca8a6c108aa64a852b374428597e0

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