Malicious PDF — malware analysis report

Static analysis result for SHA-256 4defd2f737b4531e…

MALICIOUS

PDF

41.6 KB Created: 2020-09-01 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ec1c7c62b6d9d2ad413d61159b4f294 SHA-1: 56a336cb7505f652ea460fa6f05a95ce8b8c7eb6 SHA-256: 4defd2f737b4531e65e9a53db9287a0c269132d350304cad9fcbe706ffe8bff5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.club/wix?keyword=arduino+mega+2560+caracteristicas+pdf', suggesting a lure related to Arduino specifications. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of this URL. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, many pointing to 'static.usrfiles.com', which is likely part of the infrastructure to host or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=arduino+mega+2560+caracteristicas+pdf
    • https://static.usrfiles.com/ugd/850f07_baf2a8c7dd8f483cbfb9888e2a6cad34.pdf
    • https://static.usrfiles.com/ugd/824332_179f37da3ff94df5858b1758e8859304.pdf
    • https://static.usrfiles.com/ugd/b8c837_41dbe2e84a314494ad4f080c7dd49871.pdf
    • https://static.usrfiles.com/ugd/1cc777_c881666ce3e0443abe3ab3e2c8377dbb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/tefupo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0774/files/32267469215.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/96786274762.pdf
    • https://static.usrfiles.com/ugd/e5a943_3cf516493f854a32b528a58a09c1ad4d.pdf
    • https://static.usrfiles.com/ugd/1b8612_095b020753dc4428a44f0dfeaf8c387f.pdf
    • https://static.usrfiles.com/ugd/b8c837_548c5ddb3371429b8a2356f22c464786.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_fc3ba437f9534b1aaae466e713076d41.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/353d00_e469bb4612d548618199b24a5a86476f.pdf
    • https://static.usrfiles.com/ugd/868401_583b7fbf14ed4e49a685a3db84a9ecca.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_3ff4fa90ba7143a8bd71585f02ba1c1f.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_off0000632f.bin
01f988f268425d535579798e67afd11f11820bbe6b2bcd6431b81ea719e12275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 5984 bytes
font_01_sfnt_off00007777.bin
58535f20bfb067750eaa1652691a0cdcf11f51b39c5007ae37d1e93e4a78a349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7777 9900 bytes

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