Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca9ff83d1d0334e…

MALICIOUS

PDF

35.0 KB Created: 2020-09-08 02:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7be28a2999e5fb26b9d24d0ea535174 SHA-1: 47a06b815348c152cf9b5e05d39a430f8e812abb SHA-256: bca9ff83d1d0334e4e53c08770c660edfca4da89167999052d63c5fe12559db0
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/pify?keyword=busy+busy+song+free++pagalworld', which is also listed as a malicious redirector. This suggests the PDF is part of a link farm or SEO poisoning campaign to lure users to malicious sites.

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.me/pify?keyword=busy+busy+song+free++pagalworld
    • https://static.usrfiles.com/ugd/429b25_7c398a24c10148caa6c7c4a1981210c6.pdf
    • https://static.usrfiles.com/ugd/ebbcbd_fffcdb04f66e450eb869a6073e71caa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba279458667455ebbb32874e2a526c4.pdf
    • https://static.usrfiles.com/ugd/df7b34_309797837e8242f78f83841e5c37160b.pdf
    • https://static.usrfiles.com/ugd/185811_180719d5be164486808e84747dc01bb1.pdf
    • https://static.usrfiles.com/ugd/89602e_bf48e14677464c72823ed2578d6a83c1.pdf
    • https://static.usrfiles.com/ugd/7cefa9_8384e4d0b39f4a93a8b685b3e378ede0.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/44970241330.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/63744066271.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/17299791119.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_off000049e0.bin
7905cb8178a0d6f93d9ddea8e65276e57ae550fab2fd7e67d7e70aaa2eb85e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E0 5592 bytes
font_01_sfnt_off00005d09.bin
2335e54c63ff9a9c47af03f97379fc8df818afcbf4c75080bdab5b9564a1b1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D09 10168 bytes

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