Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f44ee2eaf19c87…

MALICIOUS

PDF

32.3 KB Created: 2020-08-21 03:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f58aab42b4a111a8cb4ab466479a8c78 SHA-1: d6c501abc5d35fc8fad7d5910ad51665fa832b2c SHA-256: c4f44ee2eaf19c87f3e5944c0fb5bff53acf46bd33b9afa18195e4d2f38818d2
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to potentially malicious redirectors. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=bluecoats+creep+sheet+music'. Another heuristic noted a PDF link farm with numerous external links, suggesting a coordinated effort to distribute malicious content. The document body itself is heavily obfuscated and contains some of the extracted URLs.

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=bluecoats+creep+sheet+music In PDF document text
    • http://files.madpuzzler.com/uploads/1/3/0/7/130775191/xumidigirerafi.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/1/0459/9051/0749/files/januzewemu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/86399216002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/revit_structures_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/22084845114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1595/3817/files/tifovuxomemejujasipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/86557131817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/catalogo_recompensa_total_banorte_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/29091139881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/pusexamoxenijenojifetar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/8888394920.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 3

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_off00003f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F73 5224 bytes
SHA-256: e5502d925b1366627e8394297ff2366f1784fa50c0a2fdf1f14a12ca65074665
font_01_sfnt_off00005106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5106 10816 bytes
SHA-256: 115dadb1a351ac47d940b803229bf36bcbf705b917537f377d5a7590c450f02e

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