Malicious PDF — malware analysis report

Static analysis result for SHA-256 c497619fa25e46fa…

MALICIOUS

PDF

56.3 KB Created: 2020-08-18 18:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: af43544e7f3b3a944dd3946ef071f630 SHA-1: 847ef7f95ecea80242fc9a608c93708d503c2df9 SHA-256: c497619fa25e46face9892f37d0b79b103baf7454eeda0c2cd8b07122502c3be
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=sandwich+theorem+calculus+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. 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.ru/pify?keyword=sandwich+theorem+calculus+pdf In PDF document text
    • http://files.rocio-madera.com/uploads/1/3/2/6/132681342/4395982.pdfIn PDF document text
    • http://files.feathersinthestream.com/uploads/1/3/1/4/131483148/6864300.pdfIn PDF document text
    • http://pamuk.edwinagustafson.com/uploads/1/3/1/8/131858540/3db287f204da.pdfIn PDF document text
    • http://bobarek.unscriptedfest.com/uploads/1/3/1/3/131398473/4535173.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/1/0430/8199/0295/files/xulirupaxaziwumewito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/robinhood_python_api.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1245/4557/files/22271950460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/34783623353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/beedi_scholarship_form_2020_18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/77567512606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/kiss_the_rain_sheet_music_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/barron_s_sat_practice_tests.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/94076473343.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

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_off0000771e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 5588 bytes
SHA-256: fd3487ff0283e1352137248f90995a027133d062ed24156eed24e11a749f8710
font_01_sfnt_off000089fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 16648 bytes
SHA-256: 82faa53ac27e6dc303e502fe81dd0ead1b86ab2fa965228cadad7602e77fc129
font_02_sfnt_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 16280 bytes
SHA-256: ff9b4e7a25d0f1861695234b11a1f9dea8cc33768ea8c2904995884924116764

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