Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4c9869e6b85239…

MALICIOUS

PDF

46.9 KB Created: 2020-07-22 21:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e178b108660ac9e316875c5cd6c54790 SHA-1: 191b0f53cfd273ac8c64a7572d4535af4573fb0a SHA-256: 8c4c9869e6b852393275530ff24d0e691730782afdf2759f20b987cfe4399439
154 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. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is ttraff.cc, which likely serves as a gateway to further malicious content.

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/wb?keyword=free%203%20and%204%20times%20tables%20worksheets
    • http://files.pkpowders.com/uploads/1/3/1/1/131164460/2349351.pdf
    • http://files.jimgymsupply.com/uploads/1/3/0/9/130969532/633868.pdf
    • http://files.beloayiti.com/uploads/1/3/1/4/131453493/sapileji_sigakudob_nizagim_sojidawox.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/tepake.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/riwilatok.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/21841688489.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/jevevabota.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://gitebilav.files.wordpress.com/2020/06/wojaxowozi.pdf
    • https://jekiwex.files.wordpress.com/2020/06/55862880197.pdf
    • https://nozikop.files.wordpress.com/2020/06/11709085555.pdf
    • https://mirumiw.files.wordpress.com/2020/07/75013702601.pdf
    • https://wopapifura.files.wordpress.com/2020/07/6156325869.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/75587287857.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/kavalaxemozalex.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/zerutibozuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8152/files/xowumaseviwojopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/58647866307.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/92903260931.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sefumiwizekoreletete.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/17125600446.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_off000072ff.bin
c49c6b35ab68abd7e1b1a30ecd0c83b5dbd8566dc3271934193cf6aefe7ac8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 5356 bytes
font_01_sfnt_off00008510.bin
5f1f168a80bd6564f5f4b88f6dad6e2d58dc64d1f50a867b1346bb89f41fa88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8510 12940 bytes

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