Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0ab391b7aa2a42…

MALICIOUS

PDF

38.5 KB Created: 2020-08-13 02:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 947bb8ffcef3e6424cd380201d05413a SHA-1: 30d8c15ab3d5832231fd7b5215eb2df5e6fb0b31 SHA-256: 4e0ab391b7aa2a4251e65b42731b65accd8a4c8009a439a7a79f51bd1bc05fd6
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/wb?keyword=calculating%20circumference%20of%20a%20circle%20worksheet. The document body, though heavily corrupted, contains references to a worksheet and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a large number of external PDF links further supports the SEO link farm heuristic.

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=calculating%20circumference%20of%20a%20circle%20worksheet In PDF document text
    • http://files.grillhousearmenia.es/uploads/1/3/1/3/131379439/489133.pdfIn PDF document text
    • http://files.dismag.org/uploads/1/3/1/3/131378779/rufopunumizure.pdfIn PDF document text
    • http://files.micpr.org/uploads/1/3/0/7/130739519/sogizivonozalexira.pdfIn PDF document text
    • http://files.greggrussellstudio.com/uploads/1/3/1/4/131405958/ganikabesen-kugozujelisuki.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/1/0434/2359/6693/files/26864647447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/lojidunogizip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/bosquejos_biblicos_evangelisticos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/52148555264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/simple_present_tense_worksheets_for_grade_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/penowugaberab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/bopp_tape_manufacturing_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/91556800648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1307/8174/files/gefijexofonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8870/6717/files/19607164172.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_off000057c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C5 5356 bytes
SHA-256: 0669efeefe14adc0c54c8000caedac4544b2652bf9ea7a06932b52cc2b1cb29a
font_01_sfnt_off000069e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E0 10124 bytes
SHA-256: d8b5d739377d3017fd6c81cc34c7dfad35d6726c1406d9b454c6184c05dbd83e

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