Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cddc83d5f567ba…

MALICIOUS

PDF

59.1 KB Created: 2020-08-30 05:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 811b1d1f15b8ba6f2ca7c5d17c12d88c SHA-1: ba9f11933d34ed37c8765b94c6d3184b066e95d5 SHA-256: f9cddc83d5f567ba8090eb1d71a795f476c469331a392ec27f7c8b369593ed4c
120 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, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, https://ttraff.ru/wix?keyword=elite+dangerous+mining+guide+limpet, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure under the guise of providing a game guide.

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=elite+dangerous+mining+guide+limpet
    • https://static.usrfiles.com/ugd/b8c837_63be9aad80654b8fbedc3e38fa9dc152.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e60ee4fc6f5484e9be09e64f796be54.pdf
    • https://static.usrfiles.com/ugd/b8c837_020fe300be4e4cbbadafe8ae2b3033d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c35bd179ac7a4036a742c1aa8f7f46b5.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/30692972732.pdf
    • https://cdn.shopify.com/s/files/1/0433/1634/7035/files/xonediwazik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/vuladuzawup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/sirelike.pdf
    • https://cdn.shopify.com/s/files/1/0433/8253/8403/files/50923288717.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bda6d54d05406995810c9285a2a118.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d9ea0f57004c04b51958ec8cf844ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_87f33e0bafed4d5fab536b8245b00c96.pdf
    • https://static.usrfiles.com/ugd/fd3290_2f85ead8079043eba15bf16fdf5884e0.pdf
    • https://static.usrfiles.com/ugd/93c935_ed65807f941a42aea45b8fae39fae4de.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_off0000a9a5.bin
0c4e06cf24616e7ab52c0f23e9b81a070017a1f311b045a3d76537f93e48ae44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A5 5236 bytes
font_01_sfnt_off0000bb59.bin
e59f9e96f9dd90557d78646168f80375ccd3d74d7b1c0ed17584229c8272c93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB59 10524 bytes

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