Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b908e1ee62662…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 17:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2770ff2105cf89c68a8e213e7b8f3bf9 SHA-1: fe9d30945429b8827b02e90660c29971a49b7c04 SHA-256: 1c8b908e1ee6266221891a665fb32b5b7a95e48cc50e8c50f557a381ba75fd5a
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at https://ttraff.ru/wix?keyword=ikariam+barbarian+fleet+guide. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure under the guise of providing a game guide.

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.ru/wix?keyword=ikariam+barbarian+fleet+guide
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/39729284052.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/wotulixugetugexakan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/transformer_amps_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/pifojikobigufirogiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1029/files/ximesemeduz.pdf
    • https://static.usrfiles.com/ugd/8d57bd_31c7079adfd94a6a86f6285a5cc69185.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbdb7c50413848b8ac4bedb6f42ab5d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_35396f3a25dc4e48b77620c942a71c0f.pdf
    • https://static.usrfiles.com/ugd/4725f1_7dae006ae25344258193fab796a92180.pdf
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/8ba634_3360bcbff8aa46378f9d29f244694b6c.pdf
    • https://static.usrfiles.com/ugd/837d34_013da8b7086b49638367e6a2643a4c30.pdf
    • https://static.usrfiles.com/ugd/57c819_1db9e575d27a4a3c8f291c0e80a7f19a.pdf
    • https://static.usrfiles.com/ugd/fd3290_29a12a16d33f40c8bca3ec82828e4cbb.pdf
    • https://static.usrfiles.com/ugd/724fb5_c9490358c7b54deda37856a213f65a3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fb9aedc51804b0da9bd5ac73ec33ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d68b757b6564f6597666d79b09c24aa.pdf
    • https://static.usrfiles.com/ugd/ec0c41_a69c448537fa4cb7bff6de5a98da2a7a.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_off00006b40.bin
77fd799f6891c735edbb7345b708ef3cfccfd745cc88c2e573101bc11bc0bce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 5188 bytes
font_01_sfnt_off00007ccb.bin
fc246aabe1d341ee7368d5a18358e2142884b6deb0ceca941ebddf54d0c0c44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCB 10392 bytes

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