Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c14409cb8ef613…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 02:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bae0445f9e7217f2fee2088ff8ab1d03 SHA-1: 4c6762cce5f367c7dcccdd0054b5ccb055e81164 SHA-256: 81c14409cb8ef613bf59fb534d9642c63c60bc1d818b8b3c2be41317878d8711
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/wix?keyword=naruto+ccg+rules', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain junk data along with the malicious URL.

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=naruto+ccg+rules
    • https://cdn.shopify.com/s/files/1/0431/7646/0445/files/67018229574.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/23086161695.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/dezumofibajuje.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/free_excel_vehicle_log_book_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/2624/3996/files/bubapideverigufuge.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e9fc9db0e64478096045226b572b620.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_988b70ada90144c0b36146dd65683638.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4a0729e245046edae04b76f9e289909.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba6e86015dc44ccb2f6c44a52129607.pdf
    • https://cdn.shopify.com/s/files/1/0428/0441/2583/files/27262019986.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/64283306665.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5953/files/pipabudamipinewab.pdf
    • https://static.usrfiles.com/ugd/81d6a4_be23a4e2ed7a4cccb1fc63f7565519c8.pdf
    • https://static.usrfiles.com/ugd/9757e7_7c6f56750966443ebfea736054b11273.pdf
    • https://static.usrfiles.com/ugd/b8c837_92636154c2234b04bc6406555cb7d128.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_off00005fe4.bin
94aeae70f59fca1497802c2841942760770ddd0942292b75dbd2eaaaa17d708b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 4936 bytes
font_01_sfnt_off000070c1.bin
db24c456425dd9f9c0ef74c511af187e351526020cf275c30df0ea7fd40ed262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 10212 bytes

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