Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a16b84444d3236b…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 14:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c80b14bbb0ce2c530f6aec41cbb0d7d SHA-1: 1984f164e448c51896a9182057548e71d3bae6be SHA-256: 4a16b84444d3236b5af863fe391c0decf83398906843a2cc519167c1b0cbde93
194 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious URL, disguised with a keyword related to an essay topic. The document body, though heavily obfuscated, also contains the malicious URL and numerous other links pointing to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The primary malicious URL is https://ttraff.cc/pify?keyword=argumentative+essay+school+uniforms+introduction, which is likely used to funnel victims to further malicious content.

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=argumentative+essay+school+uniforms+introduction In PDF document text
    • http://xokuko.gcamp.org/uploads/1/3/1/0/131071114/c7ba937.pdfIn PDF document text
    • http://files.poseidonplay.com/uploads/1/3/1/4/131453733/vurugede.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/1/0439/4074/1275/files/xozevugosovet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/5442387345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/possessive_nouns_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/morekarixikepunokikoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/lusejule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/66811651816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/67903314797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/juki_lu_563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/zibenugutosatadeduj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/fodate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/bakuwiwexojuditijugobusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/91532951438.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 1

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_off00006043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5588 bytes
SHA-256: 66ae50471c3eb815ef71db30388064dc58e0de96ca4b5f6806cd1680cb9acda6
font_01_sfnt_off00007319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 10008 bytes
SHA-256: 1f535670077167012f1d19876b093c0154fc5bda6945690518c6c6b707e0bee3

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