Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e665a3f8a906ad…

MALICIOUS

PDF

46.4 KB Created: 2020-08-29 14:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1d29b4e5fe4e18f3c571c4a15acb9e4 SHA-1: cc0cad58a97039bd3b9e44083303580c94559d85 SHA-256: c5e665a3f8a906adb0b8ba97df47b02edcc18c0505e16a4c9308c5ce19cceda6
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with 28 pointing to Shopify-hosted PDFs. One of these links, found in the document body and flagged by heuristics, redirects to a known malicious domain (ttraff.ru). This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=como+aprender+a+dibujar+personas
    • https://cdn.shopify.com/s/files/1/0433/1254/5950/files/cvc_word_families_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/70883732518.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/algebra_basic_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4437/0594/files/42298277990.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/zedidatizajenera.pdf
    • https://static.usrfiles.com/ugd/565485_687e8c5ee1064fe582acd3f127c9e74e.pdf
    • https://static.usrfiles.com/ugd/b8c837_508cda4d23d54856917eb2fdf5afd3ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_3654629aa2064e9a974cda5dc80845c2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/luxepaxolulezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/vipokixu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05324d297dc4267af379c80f65fd9a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f859ae14ad842668a2045c447be4da2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ead90ef71f9848858fb5feead66f8880.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f00cb263d2946a187232e735135053d.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_off000075b8.bin
ae753a7f28bf24a696133738af795ace5c9259a66fd541d5046a87947c0134f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B8 5192 bytes
font_01_sfnt_off00008739.bin
d787742ace7fa3348a2e5495d9a90c0934399b8bae9f3d4ecc7133af00d37e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8739 11100 bytes

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