Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c6bfbae399a37…

MALICIOUS

PDF

40.4 KB Created: 2020-08-10 05:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ec8e6fcb99cb4c249e941f6c3b808e05 SHA-1: fa6a416294d7df0360a7dc0f8a788160ca454e38 SHA-256: cd1c6bfbae399a37a913431ea04a39cc7d74f16efee5155a2d6b2b9724274998
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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.com/pify?keyword=pneumatic+servo+system+pdf In PDF document text
    • http://files.nishidaexpress.com/uploads/1/3/0/9/130969312/9816582.pdfIn PDF document text
    • http://xoxanu.bloomfieldhillsskiteam.com/uploads/1/3/0/7/130776031/9cf507489b30f.pdfIn PDF document text
    • http://files.goingcrazyinthegreenmachine.com/uploads/1/3/1/4/131452778/35ad68879d7.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/1/0432/6467/1909/files/99234334240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/tigir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8130/1158/files/6589794886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/83381166361.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/mogenutixat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/historia_clinica_psicologica_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/94791341162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/sifusizelukanejosami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/bodarulorupirikukud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/vologagekiluli.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 2

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_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 5432 bytes
SHA-256: fb8162bddd2dbd8442abc791428f99058833d03c227e6e3aa15dcc354c5a627d
font_01_sfnt_off000073c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 9816 bytes
SHA-256: ecb5e697131b3072c650593f9c404e9642ee8a03f26c11cd057f6dc67894374a

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