Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd518ae54f0efdf8…

MALICIOUS

PDF

43.0 KB Created: 2020-08-20 06:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c22a46942172510f7d4a30c8accde037 SHA-1: ab81737966cc3bd7928a273bf7fcb6f5602d7b7a SHA-256: cd518ae54f0efdf85740bfd01dc4b5fff324dff2920698e470ede15d73f1f9fe
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to ttraff.com, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'free kindergarten writing sentences worksheets' and the malicious URL, indicating a lure to entice users to click on the malicious links. The presence of a link farm further supports the malicious intent.

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=free+kindergarten+writing+sentences+worksheets
    • http://files.leacouture.com/uploads/1/3/0/7/130740073/xurovidosuweguda.pdf
    • http://files.mariachristinepericozzi.com/uploads/1/3/2/7/132741194/zosoxane_pijimutatim_fuvalubopimuwi_bikejew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4369/files/meez_hack_no_survey.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/majajuxizewaris.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/history_of_computer_hardware_and_software.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/memixolopabelufif.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/35361589818.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/githut_remove_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/nursing_case_study_assignment_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/zero_to_one_by_peter_thiel.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5842/files/padukalapig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/illinois_boat_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/carmina_burana_letra.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/uso_de_testosterona_para_aumento_de_masa_muscular.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_off00006a06.bin
70cdbe4fa88035f2fbfa06cbe6041b6a05a823ada8035b465af0c31d5b36cee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A06 5280 bytes
font_01_sfnt_off00007c04.bin
e467e7f59e6b692c5f4c376cdad84e153342234b88efe3f8c1ab50687ee6632b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C04 10156 bytes

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