Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c07db9d6f3bea3…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 09:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d37e344bc4dcd2f17d0a1afd6119135 SHA-1: e833b14d1f0d0d992094f434deb0da04d21d88fe SHA-256: a1c07db9d6f3bea3f9020677e63cd5fbd6a44b26b9b617961dfda962e439f2f6
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=gateway+dx4831-01e+manual'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL and references to a gateway manual, suggesting a lure to a malicious site.

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=gateway+dx4831-01e+manual
    • https://static.usrfiles.com/ugd/b8c837_b072c06d4a21493abc00cecbcca5bde9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a08208f7fbd455ea3d34528689ae620.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6749ae73bce4fd8b2c312012ea23b8c.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_b336e66d2b28474da65509e8cffd5cbe.pdf
    • https://static.usrfiles.com/ugd/b5aed9_1a5445cc99b843f6895e2be918ab841a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef9bff7715084d1098bf4381f9438443.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf891badc31849da8cd8b63f8aa99142.pdf
    • https://static.usrfiles.com/ugd/b8c837_1db9cf71629548d7b3dc077b23ff0c00.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a67f2849b8864f6988e8adcec801646c.pdf
    • https://static.usrfiles.com/ugd/b8c837_701b8985ac11465f8bac312c70df71e6.pdf
    • https://static.usrfiles.com/ugd/529dbf_371f16e89daa4a27a6a71a6e9f7a799d.pdf
    • https://static.usrfiles.com/ugd/e745be_45ff5c4a91a84cb7b6557e1f10557a35.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008321.bin
d9e3fe5f68ef85f6dfce244a303ae859f0aa49770378d6bcc8ed178e6059735a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8321 17384 bytes
font_00_sfnt_off00004d51.bin
6f4379d1663fe580d7d11c5d22f3bbb0d88844a94e1d008e9213c35dcb2ffaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D51 5660 bytes
font_01_sfnt_off000060c2.bin
c4b67075aab53de076608b38cd357326f1e496f7ef030f8ae2acecb002a2e6e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C2 9968 bytes

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