Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20b7a5ac84336d3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-06 12:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017b00ea06deb1cf6770d04d7e6eca6d SHA-1: c23db9eb5119aeffc23316c30deaca6faa1c0373 SHA-256: a20b7a5ac84336d369d589d5ede6a6e8259836e11f9a84f9f7580655e5b69429
150 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 pointing to 'https://ttraff.com/pify?keyword=rodalies+renfe+r4+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to lure the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=rodalies+renfe+r4+pdf
    • http://files.unbndglobal.org/uploads/1/3/0/9/130969505/rajijizipawuzezok.pdf
    • http://files.birthbeforeandafter.com/uploads/1/3/1/8/131871786/7766033.pdf
    • http://widekum.us-msminer.net/uploads/1/3/0/8/130874050/betupepemugov.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/82952042591.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/aristofanes_comedias.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0675/files/mv_command_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8271/1201/files/42419495419.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/alkanes_alkenes_alkynes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/sa_li_file_khng_m_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/lakuzufopubafoduxor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/30223132750.pdf
    • https://cdn.shopify.com/s/files/1/0439/3769/3851/files/java_word_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/34336841488.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6582/files/bivejara.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/nadafumediw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/fozamil.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_off0000604f.bin
28af3dfb59bbb40bb25a755a3e059ea9bcc5ccb000ae4c01ede6d1df366a8f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 5132 bytes
font_01_sfnt_off000071dc.bin
b3d6232bad6cb46b1e51a9028d5589e8896e9e9108efca344a4fff76e67a8b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 11756 bytes

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