Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdc41f4128d7941…

MALICIOUS

PDF

37.8 KB Created: 2020-08-22 15:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3eff87d1a9e9b3bfd86f8bda26cc26f7 SHA-1: 283483a28e93f6da3b4b7421334f3cd114c34852 SHA-256: 4cdc41f4128d7941585346c90f8a654a93f2aa320467a883db610c0642bf20cf
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, a technique often used for SEO spam or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=guozhong+cao+nanostructures+and+nanomaterials+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to malicious infrastructure.

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=guozhong+cao+nanostructures+and+nanomaterials+pdf In PDF document text
    • http://files.jennifergallagher.com/uploads/1/3/1/3/131382030/kejeferubiluzo_fazorinoleroz_zusavowemuxit_fegujumi.pdfIn PDF document text
    • http://files.austinyouthfitness.com/uploads/1/3/1/8/131855992/bofijaravojaxidibop.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/1/0431/9097/6673/files/pdf_to_word_converter_premium_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/nalegidutazewukoxido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6237/6088/files/msds_sheet_for_isopropyl_rubbing_alcohol_70.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/pupedaxarifiridodebiwul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/kenugapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/bilugamumotulebetowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8267/8439/files/barefoot_investor_steps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/kinetics_of_cationic_polymerization.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_off00005522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5522 5652 bytes
SHA-256: c95716a672a375c64bc98419e3b753d403bb77dd36f1b01b52958c86f410539e
font_01_sfnt_off00006838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6838 10052 bytes
SHA-256: 547f01bbeb84c6f57df0ff12629f19cb40c2dce75a494aa5893fc568223f5fc9

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