Malicious PDF — malware analysis report

Static analysis result for SHA-256 803a703edb706731…

MALICIOUS

PDF

31.5 KB Created: 2020-08-17 15:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 220f821ff1f6c214bfd4726f1e5b1ec4 SHA-1: 9371bd8f5ab1a05b10b4d52b1178c8d07f6e9658 SHA-256: 803a703edb70673135d5670f0ecb336cc0a36471225e8ffd6673a37cac82115b
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 at 'https://ttraff.ru/pify?keyword=eadms+answer+key+biology'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of many external PDF links indicates a link farm strategy, likely to obscure the malicious redirector or to improve SEO for phishing lures. The ML classifier strongly flagged this PDF as malicious.

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=eadms+answer+key+biology In PDF document text
    • http://nemir.texascountryweddings.com/uploads/1/3/0/7/130775732/nabum.pdfIn PDF document text
    • http://files.huntersroots.com/uploads/1/3/1/8/131871864/lajakareseb_mixetenijo_xegosebiva_tojel.pdfIn PDF document text
    • http://gugup.wakefieldpodiatrists.co.uk/uploads/1/3/1/3/131398101/9651453.pdfIn PDF document text
    • http://zasiguv.amereldas.com/uploads/1/3/0/7/130739223/688989.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/1/0430/9906/2421/files/missing_letter_worksheets_for_kindergarten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/zexosifuwagagiluvovejix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/angielski_swka_chomikuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/zekoguwoxafixutizakoferij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86399573169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/gemezibesumipidupezelaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/rise_of_the_guardians_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5842/1142/files/terry_eagleton_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9394/0642/files/ministry_of_finance_indonesia_annual_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/enlace_quimico_metalico.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 2

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_off0000425f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x425F 5500 bytes
SHA-256: 044780da971e6a70df01e55260ce18ea59ba960ea70c099fe0c402b6c4e5eba3
font_01_sfnt_off00005516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5516 8396 bytes
SHA-256: ff7a3cbab6615445fe1f9be43e2031319bedc8c44d52c4cb8b9e7a8f682da461

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