Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55c8d46959a831c…

MALICIOUS

PDF

46.8 KB Created: 2020-08-18 17:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 990182446a306abe3a9e6e257afdf3ea SHA-1: 436701dfc16b8676243ae543a9de391e1d37a280 SHA-256: d55c8d46959a831cca4ea62b73b9825fa90bae9b2d60ada1110100fe131156d9
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 it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cineform+cfhd+codec, which likely serves as a lure to a malicious site.

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=cineform+cfhd+codec In PDF document text
    • http://files.shellystill.co.uk/uploads/1/3/1/8/131856306/petuwusenalogi.pdfIn PDF document text
    • http://files.norbertdelacruziii.com/uploads/1/3/1/3/131379718/9067480.pdfIn PDF document text
    • http://files.alpacacomputing.com/uploads/1/3/0/7/130774969/8744627.pdfIn PDF document text
    • http://xanune.canadaslegalconnection.com/uploads/1/3/1/6/131637254/zuvojejagomano-tojalulowirovu-raxexelu.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/1/0429/8807/7209/files/jemutanuvedejelub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/ronedat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/51465056065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/vikings_season_3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/kezuxulun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3955/9573/files/algebra_questions_year_6_sats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/simon_ielts_writing_band_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/texid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3636/9318/files/animated_desktop_backgrounds_free.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 3

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_off000077aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 4744 bytes
SHA-256: 4416a0e2d1170e8b9ad7b2b31732e0bd15729afc6f0e61da192d681446d183d6
font_01_sfnt_off0000879a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879A 11676 bytes
SHA-256: 2d447d84d4540a618d73d41854bfd6f955c0cfab92d468875a58900ebe145525

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