Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7253c2578e9aadd…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 633edc313fcd53195b8998b602f149a9 SHA-1: 5fdac8cd516b4387281e6de0f7eaa4ebfad939f2 SHA-256: b7253c2578e9aadd6b8d23c4ae9f06a0c4a6725451d9efa60d1fde1e876f162d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a link farm and a direct link to a known malicious redirector, disguised as an "Eutrophication worksheet for students". The primary malicious URL is https://ttraff.ru/pify?keyword=eutrophication+worksheet+for+students, which likely leads to further malicious content. The document's structure and embedded links indicate a phishing or malware distribution attempt.

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=eutrophication+worksheet+for+students In PDF document text
    • http://lelawibi.ambergirl.org/uploads/1/3/1/6/131637036/a22efc3278085.pdfIn PDF document text
    • http://files.185686508.com/uploads/1/3/1/4/131407106/6c3dfce.pdfIn PDF document text
    • http://dumezufam.kathrynthornton.com/uploads/1/3/1/8/131856979/1739198.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/1/0434/3077/2901/files/tuwukasezuzorazujomonabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/93740645281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/44233529615.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/dogatedinox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/35158345435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/54536781804.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/sosidemoruror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/41783169265.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/bimuralifakabarub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/abordagem_policial.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 3

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_off00005518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5518 5204 bytes
SHA-256: f63f45523ebde5550478f2ea861e2ce083d1b50b41866a0a22e0d77ee3a5824b
font_01_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 9988 bytes
SHA-256: 376627ea5f42e3ba74089b1034a2a0954a1228cfcb299864a83009301ea9d529
font_02_sfnt_off000088eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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