Malicious PDF — malware analysis report

Static analysis result for SHA-256 98da333fa2f02d81…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 17:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9e7433617bf97e4e9ddd87005072a665 SHA-1: af491d689fbcc1e1aa3db7b583b9c7537773a096 SHA-256: 98da333fa2f02d81d1877c82a14524523874396fff10e717cc62744ef6107f61
202 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text related to 'Symmetry worksheets' and includes the malicious URL, suggesting a lure for educational content. The presence of a download button heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=symmetry+worksheets+pdf+grade+7 In PDF document text
    • http://files.pandasofwar.com/uploads/1/3/0/7/130775432/47127.pdfIn PDF document text
    • http://files.mathkanection.com/uploads/1/3/2/8/132815123/4e1a44b281b.pdfIn PDF document text
    • http://bozilu.chichesterlibdems.co.uk/uploads/1/3/2/6/132680813/motepugu.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/1/0436/0660/5987/files/94836197252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/gevona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/zazatizuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/69444729959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/pdf_to_word_converter_download_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/34740280596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/kuzubobutodiwoleda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/24761851719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/18039754409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/xubew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4426/5366/files/14560281936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/11561845381.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 5864 bytes
SHA-256: 5de7149fd556af78e17c5eb4f8767f8f55b7bb1dce041615c75542ff41aaecc9
font_01_sfnt_off0000795f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795F 10324 bytes
SHA-256: 71eef2615cc6ae0ac0433e745bcb344e5f9a54ff2705d35e584602ca1a260c32

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