Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd34b2bcf8728b5…

MALICIOUS

PDF

38.6 KB Created: 2020-08-22 10:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c1ca4594acfe4709e25cec7dc1a35380 SHA-1: e73076404474ed8ecd00af0860dd80d8f50b41fd SHA-256: 3bd34b2bcf8728b5265e5caf5ae8857b1937b40bde8761d74e87c74fbf5e8d8b
162 Risk Score

Malware Insights

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

The PDF contains a high density of embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, contains strings related to calendar templates and Excel, suggesting a lure. The presence of numerous Shopify-hosted PDF links, while many are benign, contributes to a link farm strategy. The ML classifier strongly indicates malicious intent.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=calendar+template++excel In PDF document text
    • http://files.kevinbennettjr.net/uploads/1/3/0/9/130969183/7363469.pdfIn PDF document text
    • http://danukob.bearclawepic.com/uploads/1/3/0/8/130873894/kokiwari-xavugewu-mawekuderesiv-fojof.pdfIn PDF document text
    • http://jagexamid.wer4jesus.com/uploads/1/3/2/6/132681670/nemopasil-vitesafuvoxen-fikidikefowezi.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/1/0428/9835/8432/files/43778875991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/57717008456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/keratoconus_diagnosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/wevupipatijekugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/37533967094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/lisimalobutawerajiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3107/2666/files/aprendiz_de_brujo_ii.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/76331323823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/ultimate_spines_fire_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/92753217328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/simemibimefig.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_off00005ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD2 5012 bytes
SHA-256: e43f1395dbb808680e0375730c2723a2c94ebd07c555bbd02778056c96bce60e
font_01_sfnt_off00006bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC7 9896 bytes
SHA-256: c1e97b5b4a1d34592ab6ee064d8033f95143a003cb434e1bcd8ae70ab86e031f

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