Malicious PDF — malware analysis report

Static analysis result for SHA-256 d591bde1508197cf…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 12:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b6ebf89f8c80600acbd5c22682eecfc SHA-1: 4cf087ac3af4c5c8396379b6831a47435ec46cc9 SHA-256: d591bde1508197cf9db30cef7e05e2eb0d7968d229ac77b970a4fb28e6939221
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=arithmetic+sequence+worksheet+key', suggesting a lure to disguise malicious content. 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=arithmetic+sequence+worksheet+key In PDF document text
    • http://jogavukap.wickertmath.com/uploads/1/3/1/4/131483492/nenip-bipugomili-tovafasuzevuzol-xeguteret.pdfIn PDF document text
    • http://files.edenbridgehockeyclub.co.uk/uploads/1/3/1/0/131070313/rijozewaluwuja.pdfIn PDF document text
    • http://files.starryeyesmicroblading.com/uploads/1/3/2/8/132814343/6b27c33c5a35fe3.pdfIn PDF document text
    • http://jatakox.neoes.org/uploads/1/3/2/8/132814930/morejanadejekan.pdfIn PDF document text
    • http://files.aimeespetcare.com/uploads/1/3/2/7/132710627/1cf7ec6f6ce27.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/1/0431/3477/9553/files/44797371390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/28021612083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2030/4034/files/bise_fsd_9th_result_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5128/6690/files/zumonobowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/g_eazy_random_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3418/9734/files/33667224243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/algebra_questions_for_grade_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/1931/5872/files/fewuzulofaxafaduf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1124/2144/files/73516656020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/40676828734.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_off00006cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB9 5168 bytes
SHA-256: 01179be6a9d74437ba8ad22828c6bb49b1f716d40b0a14df344f535dbdcdfcae
font_01_sfnt_off00007e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 10204 bytes
SHA-256: 5fa1df90751b147c7ac4a770b8505a73a7845054e216857bc218d496b44c7682

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