Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37e5f9c8ca766b7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-12 12:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0cdc513fcbae48fa7889f10faff75ebe SHA-1: 033c62852f61f16165a31363d441d267ad5faf66 SHA-256: c37e5f9c8ca766b7fd3e0b1edf67457fb5c7c40a5cba56135c0809d3a82c4989
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=proposal+penelitian+tentang+bahaya+merokok+pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a redirection-based 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=proposal+penelitian+tentang+bahaya+merokok+pdf In PDF document text
    • http://laluj.cadizkennels.net/uploads/1/3/0/8/130814238/mabinet.pdfIn PDF document text
    • http://files.ellenbryan.com/uploads/1/3/0/7/130775823/4947362.pdfIn PDF document text
    • http://files.sandravincentsart.com/uploads/1/3/2/6/132681359/c6b6cf9992.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/1/0437/4711/5157/files/genetics_definition_biology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5533/0966/files/38110021860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/83187890690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/soxedol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/input_file_only_and_doc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/48071218088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/98546636325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3218/9860/files/modified_bessel_function.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/dezoxetazipaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2720/9120/files/69752251720.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_off000067e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 5760 bytes
SHA-256: 77aee5cef5ceeda935bf81556b0fc66842259e03631fe3e53648ee5bd7e36481
font_01_sfnt_off00007b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B50 10012 bytes
SHA-256: 46aec88213d78dcd171a4d5f5a720366ae947db1b56df8771406b435b8f99d8b

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