Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33f5af96080970f…

MALICIOUS

PDF

64.4 KB Created: 2020-08-30 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c043f5a8f2b60cb44bad342b86c78d SHA-1: 910977d2cc85c42cab28261d8e2efaef3bb7df16 SHA-256: b33f5af96080970fcce85e7b235c58a29a358b1dc1addbf3187830b6b46e0258
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=cariotipo+humano+normal, points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be luring users to malicious sites via the link farm.

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.cc/wix?keyword=cariotipo+humano+normal
    • https://cdn.shopify.com/s/files/1/0454/6487/9256/files/pdf_to_word_i_love_my.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/fojove.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/air_pollution_control_engineering_noel_de_nevers_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_e14af3858e1a4c8395955d88307a7e7a.pdf
    • https://static.usrfiles.com/ugd/8d57bd_2f142296a33b426397dd36da4d3e3f53.pdf
    • https://static.usrfiles.com/ugd/db1da1_573bb7a6021f46ad8bcdb5f9c35cd193.pdf
    • https://static.usrfiles.com/ugd/b8c837_26cbeba4ddf04da9969db20fa7e30476.pdf
    • https://static.usrfiles.com/ugd/99965f_c0e4afca3e1d4aad9871b238463ce012.pdf
    • https://static.usrfiles.com/ugd/696b8a_9bf0f1e436db4640bfb0368589d17893.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_308f1ee0b07a461c89d7af9014235011.pdf
    • https://static.usrfiles.com/ugd/3bca44_8d326a9eaead44729303a753f3736d50.pdf
    • https://static.usrfiles.com/ugd/3649d2_54992a8d44d84d8a82171824ea027482.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/diagnostico_de_neuralgia_del_trigemino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.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/
    • https://cdn.shopify.com/s/files/1/0454/648

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc8.bin
a36048e78141d9b10fd872a4cf6ef74e9948966155a8b2bbc277f132f05facf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 4668 bytes
font_01_sfnt_off0000bf71.bin
0ac9cf4ded91871e22a25c3d2165471fd06fd2e123ba3ac7149bc98431aab7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 11432 bytes
font_02_sfnt_off0000e4c0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 4324 bytes

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