Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca78c0266a0907c4…

MALICIOUS

PDF

41.2 KB Created: 2020-08-04 10:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f5a7d47cfae0c21c0e9645c85162bd2a SHA-1: bed873ac9d45c132e4085ec424cebbd5a92d184a SHA-256: ca78c0266a0907c4636399afd492d20bb706b2595a0d579644cb2ddf49a996b8
194 Risk Score

Malware Insights

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

The PDF contains a high density of embedded URLs, many pointing to Shopify domains, which is indicative of a link farm or SEO spam campaign. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.cc/pify?keyword=arduino+uart+tutorial+pdf`. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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/pify?keyword=arduino+uart+tutorial+pdf In PDF document text
    • http://files.pellandconsutling.com/uploads/1/3/2/6/132681836/6417755.pdfIn PDF document text
    • http://files.theemberon3rd.com/uploads/1/3/0/8/130813965/a25c80.pdfIn PDF document text
    • http://files.inspiredmusic.us/uploads/1/3/0/8/130813111/856c2df047f.pdfIn PDF document text
    • http://files.alorenzdesign.com/uploads/1/3/0/9/130968985/tigudiwakeg.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/1/0433/3872/7589/files/41892316278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/45041596241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4335/6821/files/zuvexiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/98796057954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/44060345417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/relus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/66294703158.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8483/1125/files/ladegogorewesewimesokuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/93122210848.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_off00006305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6305 4848 bytes
SHA-256: c772ae7ed3cc1f0fb8db7062858317f701b5985f2ee7c9d14888eb0dcabeb662
font_01_sfnt_off00007392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7392 10088 bytes
SHA-256: 29df84edf902ee1740d0b1d9cbd10f9085d9d760a2270c386cefc1896dd92a98

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