Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc5586b52d95c1c…

MALICIOUS

PDF

38.5 KB Created: 2020-08-06 16:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: af37f2151a24bd59c35a576a2651e3cf SHA-1: 33a99d1d4dc30f8e9e327cb695c3663dc3beebfe SHA-256: ddc5586b52d95c1cadc64650a9ae774a15dff25bbe8b0cca1ddd435162829930
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=calculus+of+variations+gelfand+fomin+pdf'. This link is designed to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to PDF files hosted on various domains, including Shopify. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=calculus+of+variations+gelfand+fomin+pdf In PDF document text
    • http://files.augustinepotter.com/uploads/1/3/1/4/131453251/9002928.pdfIn PDF document text
    • http://files.mrdeleonardis.com/uploads/1/3/0/9/130969762/e85e6cff7f42.pdfIn PDF document text
    • http://files.alanbermanart.com/uploads/1/3/1/3/131380052/7346113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1801/9235/files/annexure_h_for_passport.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/arch_linux_installation_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/how_to_make_a_fake_virus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/mugen_character_database.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/68140487003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1458/4477/files/40k_codex_vk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/41624221460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9670/2104/files/58674821450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B52 5440 bytes
SHA-256: ccbd8fe5d720faa000190954d82fbdcd4b5c85996cd61b14c9df717c5587de5c
font_01_sfnt_off00005dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC2 9736 bytes
SHA-256: 7d6ab8ea338b7282ca2be9d189e17aeceb7859ade721d1b858ddd50e0091a3d5
font_02_sfnt_off00007f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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