Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4af4c995d7b496…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 04:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 98c19895314b640a65cb609a18cf6bc7 SHA-1: d923d69e26794a721d6b5434fff9032626bb2341 SHA-256: 7e4af4c995d7b4966963089758a656d068a5b9dce529fa5278687ba1fd8c04e9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure for free worksheets, which is consistent with the SEO link farm heuristic. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware download site.

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=free+year+5+english+worksheets+uk In PDF document text
    • http://files.arshadsaeed.com/uploads/1/3/0/8/130813528/dfca2e0f1c8023c.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/1/0432/5313/7576/files/d_d_5e_bard_spells.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/bhagavad_gita_chapter_1_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/800_thread_count_egyptian_cotton_percale_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/soburaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/hennessy_patterson_computer_architecture_5th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/duxenatenawer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/wegoninulexaxovup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/53066480663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/pabuzitave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/zalozole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/ligamimisabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/tepobudataka.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_off00005cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 5284 bytes
SHA-256: 67ae51a4aa07ed8e47a5b3f4cce8b2eb3d34d350acc3e975eb490202770f24b3
font_01_sfnt_off00006ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBE 9888 bytes
SHA-256: 94a216555783393c624c3dd2aff1dfb4b59d6ba4579ca03aba3c5cff1ca2b5b9

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