Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd61b055ab43c4eb…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f7b47f9a666a9888e95ed08ba7a12c8 SHA-1: eb05021027399b41c49b69a356d914a7ee647ddc SHA-256: cd61b055ab43c4eb3faa134e0d63cc639521ead15d95a798397e0ff5f63df00e
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=3+digit+division+worksheets+without+remainders', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, likely to improve search engine ranking for deceptive content. The primary malicious IOC is the redirector URL.

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=3+digit+division+worksheets+without+remainders In PDF document text
    • http://files.dpdesq.com/uploads/1/3/0/7/130739780/afe3c45989a3ea1.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/1/0430/7006/2754/files/bavug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/vowidazitene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/arithmetic_reasoning_practice_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/xorofuwidafasasuzirob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/73086035030.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/zasukezikis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/78086355894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/canon_photography_tutorials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/25778779884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/59734281710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/nenejilifugufalebusubamow.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_off00005aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEB 5492 bytes
SHA-256: 5913c5fc670408aeaa028b90e3fa539a86fa545e0b61d4bd0ecee036019967c8
font_01_sfnt_off00006d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 9696 bytes
SHA-256: ce6bd3454e35107bd9d084e4bade63637a6fa71b56550c071455aabcd07c35eb

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