Malicious PDF — malware analysis report

Static analysis result for SHA-256 c339f876806d16f1…

MALICIOUS

PDF

43.7 KB Created: 2020-08-23 13:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2d6e34242e79d625b5a74d3a62a91562 SHA-1: 8898f47916ba375ab8e14a682ee3ddfa72e2efd7 SHA-256: c339f876806d16f1a324725896e278d1e7c5fabe571dc0d74a1aec8e3d61da9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=ccna+chapter+2+quiz+answers+2018', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments suggesting it is a lure for 'ccna chapter 2 quiz answers 2018', likely to entice users to click the malicious link. 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.cc/pify?keyword=ccna+chapter+2+quiz+answers+2018 In PDF document text
    • http://files.pwbc.us/uploads/1/3/2/3/132303075/feduxelu.pdfIn PDF document text
    • http://files.avriltahoe.com/uploads/1/3/1/3/131379833/batison_mibalog.pdfIn PDF document text
    • http://finemalo.haroldkramer.com/uploads/1/3/2/7/132740494/vajulinufusox.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/1/0440/6693/0840/files/ccna_1_practice_skills_exam_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4541/2245/files/does_he_like_butter_tarts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/62185331003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/urticaria_y_angioedema_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/wemapurenexilizewubofix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/50866785005.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/xewokofimifuxagig.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_off00006c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C94 5684 bytes
SHA-256: f17302cf023654779c3362892e29ce6449aab6537d7691fa3fb7c9c61dd9815c
font_01_sfnt_off00007ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF8 10004 bytes
SHA-256: f0fa425ad0fb252dda4a6429ad98c0d278bc8bdccf5e4bc40a9af7b53a858495

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