Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cbfb035168541c…

MALICIOUS

PDF

36.8 KB Created: 2020-08-17 14:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef845616c541cf67ec19fc8269d3e246 SHA-1: cac6327600d198bf1175ed4ccfd8969b4907abe0 SHA-256: b7cbfb035168541cc75cd9b3b1cee93651344703c997724a36cc86fb855cc9ec
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=the+fall+of+yugoslavia+book+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'The fall of yugoslavia book pdf' and the wkhtmltopdf generator, indicating a lure to disguise the malicious links.

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=the+fall+of+yugoslavia+book+pdf In PDF document text
    • http://files.ncbyouth.org/uploads/1/3/1/4/131452922/1667286.pdfIn PDF document text
    • http://files.dreampathwayskids.org/uploads/1/3/0/7/130740563/1422338.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/1/0437/7831/0295/files/fukovavaguk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0636/9687/files/13027096732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/gemesubiguxab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/generaciones_baby_boomers_x_y_z.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/convertir_de_a_word_ocr_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/wordpress_get_current_url.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/52620837100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8185/0268/files/nululiperosatevuxolez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/8921/7960/files/61021475330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/pumesowi.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 5

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_off00005238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5238 5524 bytes
SHA-256: 13b8c6f4641a82884d2c69f15e23ee6b97ce380346c10838cf23b686fced00af
font_01_sfnt_off0000650b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 9756 bytes
SHA-256: 944e69e3d6eca531d1869395e40bed3a30fe3236a17687b1fcb86e961a45dd3d

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