Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94af6229a703e9a…

MALICIOUS

PDF

56.2 KB Created: 2020-08-09 20:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ed04cf7aaadf063ffe482c16a3f6e0 SHA-1: ad657501324eb49e504271e15faf6aea3c9c2605 SHA-256: c94af6229a703e9a3b7e597426bc28d51df06b349b0491ad1944540b4af8145e
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to ttraff.cc, which is known for malicious activity. The document also features a large number of embedded links to various PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is https://ttraff.cc/pify?keyword=o+di%25C3%25A1rio+dos+escritores+da+liberdade+livro+pdf+download, which likely serves as a lure to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=o+di%25C3%25A1rio+dos+escritores+da+liberdade+livro+pdf+download
    • http://files.claremccallan.com/uploads/1/3/2/7/132740399/zebigimozit_vuzafubo.pdf
    • http://files.thespiritoffrida.com/uploads/1/3/0/7/130738889/dubik-fisojilat-biwuzoxexiwar.pdf
    • http://files.machikkhabda.org/uploads/1/3/1/4/131407492/xuvipavituvoxu_zesuzezewo_fatevufeg_nisirifize.pdf
    • https://cdn.shopify.com/s/files/1/0434/0288/7322/files/19435689276.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/99403543933.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/mefew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/ladibivuwogawiniloxujekaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4453/files/lonugoxumusetire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/69715613376.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/57215462927.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/65666138014.pdf
    • https://cdn.shopify.com/s/files/1/0449/8564/7272/files/minecraft_cobblestone_gate.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/64336724973.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/85676895512.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/understanding_human_behaviour_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/wufejefu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009446.bin
5e5e357f85422e26ffc6b9ce8add0c4287cc51e0ea5284e1fb59a83fb56ce537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9446 5704 bytes
font_01_sfnt_off0000a73e.bin
d6147af3376e51d2b56cd5aaec0b023565ac69a140c65c1b718817a3a924ca16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA73E 14300 bytes

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