Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbef6c9a26d5e0b3…

MALICIOUS

PDF

50.6 KB Created: 2020-07-31 20:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 595561abdd3fca581caa3fb695d2908d SHA-1: a44201260508df536adc97682c437c6b51633025 SHA-256: cbef6c9a26d5e0b3159e50960cee1a58fff86ce1c6267794eaa3bc0bad61c7fd
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as a document about 'Remembering the Kanji vol II'. One of these links, https://ttraff.com/wb?keyword=remembering%20the%20kanji%20vol%20ii%20pdf, points to a known malicious redirector. The document's structure and content indicate a link farm SEO tactic to distribute malicious URLs.

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=remembering%20the%20kanji%20vol%20ii%20pdf In PDF document text
    • http://files.enemyoftheaverage.com/uploads/1/3/1/4/131438759/5944144.pdfIn PDF document text
    • http://files.susanrlawrence.com/uploads/1/3/2/7/132740405/9320225.pdfIn PDF document text
    • http://files.myrtlemoon.com/uploads/1/3/0/7/130775017/finagopoxijit_xumujitiga_pivamodev.pdfIn PDF document text
    • http://files.awstrategy.net/uploads/1/3/1/3/131381363/82600384524c.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/1/0429/6779/3820/files/42430139409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/lezijoziwidenotutakig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/38517927066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/89408854676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/fonarulejisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/xurofurufafil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugasodaliza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6195/2155/files/dowajirivemojotiwolaboku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/luzuduxizetubawivovimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/25043151879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/taxidet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/96695516638.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 8084 bytes
SHA-256: ea6281c8147ad446f486989b77b2b3b58d23880e71ffc950623cf7acb1a88500
font_01_sfnt_off00008112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 5624 bytes
SHA-256: b4b6d2c9ff6733c7482b0f6bbce58f2d073b65a8f52b6e8b46b950d48297be0e
font_02_sfnt_off0000941b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941B 12548 bytes
SHA-256: 94583409ba11a4d7ca16d8627fcbb39aa7c380e92ef97f4ecf677dd3a7cf29a5

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