Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd83d56ac6a0fce…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 17:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 384c853a7b3877dc25220195260d8032 SHA-1: 320664acc0d4258784e6a0a522ff83f39d0766c7 SHA-256: dcd83d56ac6a0fceb27d74fdc50ef73607691af083f496b1ef95e9357fd57eb7
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic, suggesting it is the primary lure. The presence of numerous other links to Shopify-hosted PDFs indicates a potential link farm or SEO poisoning attempt to mask the malicious redirector.

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=cyanogenmod+12.+1+i9500 In PDF document text
    • http://files.guidedexposure.com/uploads/1/3/1/3/131380728/82201.pdfIn PDF document text
    • http://files.lickandapromisekennel.com/uploads/1/3/1/6/131606642/05e95eb0462b5.pdfIn PDF document text
    • http://xuvurapo.georgenista.com/uploads/1/3/1/4/131452883/dunasamusa-navokimi.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/1/0431/4677/2646/files/madibirolom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/xivofagunuvitap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/56360037333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/32905673970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0239/4786/files/converting_inches_to_feet_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/dofivulonuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/wipibazurepejekumol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4659/0872/files/pdf_file_resizer_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/41199931664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/48036048849.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 6

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_off00006771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6771 5484 bytes
SHA-256: 4d694c7510d0b8b93986b7bd744f6a7b98f50ace58a7af170e88a9512b344d7a
font_01_sfnt_off00007a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 10900 bytes
SHA-256: 65406db876df386e1b6f2f9c0e2883aba28e653c6fcd853f3fd7564dbba7b440

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