Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f813ab4f8240c41…

MALICIOUS

PDF

39.5 KB Created: 2020-08-11 13:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f01f578296ad4773cfa001767d91f113 SHA-1: d1bbdc424aa53746d769b368dbf41ae7cb6db36b SHA-256: 1f813ab4f8240c41905fbfc202b14c285217d6840dad69be72514032e868a86c
194 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with one prominent URL pointing to a redirector service. The primary attack pattern involves luring users to click on these links, which likely lead to malicious sites.

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=twinkle+twinkle+little+star+violin+pdf In PDF document text
    • http://funila.tyree-mcgill.studio/uploads/1/3/1/4/131437792/53ce265.pdfIn PDF document text
    • http://files.eliseheaven.com/uploads/1/3/0/8/130814043/7ca63c0c82437.pdfIn PDF document text
    • http://files.zephyrshoremaine.com/uploads/1/3/1/4/131483491/taxafosedasezujajun.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/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/cantos_catolicos_letra_y_acordes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/ramas_terminales_del_nervio_facial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/wufaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4979/3174/files/2624631750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/7476429708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/56709095229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0250/9987/files/modle_attestation_de_prise_en_charge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/fimifamowazokibujedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/91270746406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/41749240562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/kilenupefuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0357/4432/files/agilmente_libro_gratis.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_off00005d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D12 5200 bytes
SHA-256: fa2f1037fc759776a1b7c9e625bc2e561a33da96af99daea32a3cc6a4db84eb7
font_01_sfnt_off00006ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 10092 bytes
SHA-256: 79cab580dde6eaf8e0428ffb669cc0215ed0d8b0fd45f170ef1697d88e242c60

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