Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c4315436dc06ee…

MALICIOUS

PDF

51.7 KB Created: 2020-08-12 09:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 83b5283828736d2d26b9c2f47a9383c5 SHA-1: 6e9bafec721dd894c00e51db0f0d0bbba745d3bf SHA-256: c8c4315436dc06ee33cbcd3eced0584d874bebf4bf3b66c25f39c18d535b44f0
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wb?keyword=fixing%20a%20hole%20in%20the%20sky%20worksheet%20answers%20central%20case'. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to a worksheet answer key. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com, likely for SEO manipulation to increase visibility.

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/wb?keyword=fixing%20a%20hole%20in%20the%20sky%20worksheet%20answers%20central%20case In PDF document text
    • http://files.pitchforkpreserves.com/uploads/1/3/0/7/130739340/5110528.pdfIn PDF document text
    • http://files.sixteencoop.co.uk/uploads/1/3/2/6/132695576/kikaxe_witipi_xebov_zasotewubewes.pdfIn PDF document text
    • http://files.nancymaldonado.com/uploads/1/3/0/8/130874110/rafaruke_xujuxuwep.pdfIn PDF document text
    • http://perel.spreadsheetsage.com/uploads/1/3/2/6/132695278/6299158.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/1/0431/4651/0504/files/random_expression_generator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/4970/1796/files/tewanemaludolipinalis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7627/2796/files/91543830195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/sql_stored_procedure_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/dekinilapupuzegudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lazulamugegudapuxojiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/77188927050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/78944523447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/doxarusizaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/pirates_of_the_caribbean_theme_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/45982472154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/90096928937.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 4

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_off0000819e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 5340 bytes
SHA-256: 9a68b65e3279f57d2a6d2db85cbf362c03584f6073a8a418bafa8c47e9604c38
font_01_sfnt_off000093e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E2 14412 bytes
SHA-256: 79a90b0c735227dd74510322b6d149d9cc4225d7aab9520fd26d11e4cee2f16a

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