Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa1cacb5e62adad…

MALICIOUS

PDF

51.1 KB Created: 2020-08-31 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a878198a0d0c1664f51f1343cd7f7d SHA-1: d65caf3062d512f57918a3c7593e4aab1b92edf6 SHA-256: dfa1cacb5e62adada5dea48c813379058b7ae9b54dc4929c5d274eb1a07d9afd
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=tera+female+armor', suggesting a lure to a malicious site. The presence of a large number of external PDF links also points to a link farm or redirection strategy.

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.cc/wix?keyword=tera+female+armor
    • https://static.usrfiles.com/ugd/b9801a_f57a9cf588d748f88f7c2ed32e29630c.pdf
    • https://static.usrfiles.com/ugd/8b2c09_9970a1abd2f34ecd8f9e55bc5610ea2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a734cfefba04034afa32b3a9a67140d.pdf
    • https://static.usrfiles.com/ugd/b8c837_77b5d7499a634cb2a7fe91d0c2272468.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8048/files/autosports_group_limited_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6908/files/wuluka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/datemupeze.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/monthly_income_statement.pdf
    • https://static.usrfiles.com/ugd/1cc777_50ef914c8c1d433aa9da3a0fc620e61a.pdf
    • https://static.usrfiles.com/ugd/a48928_1e91dd3f969c4f5caf202a99345856e3.pdf
    • https://static.usrfiles.com/ugd/37321e_ddcd0f27cfbb4ea6bec4d49cafc38807.pdf
    • https://static.usrfiles.com/ugd/b8c837_b585d4ecaec146a89e41ec9f34fc643f.pdf
    • https://static.usrfiles.com/ugd/9e14ca_73ef848c0d14444eb7169a4e62e6cc1b.pdf
    • https://static.usrfiles.com/ugd/f459ea_a3cef52dd3c845fbafaf604db0049cdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf74f1ab28294179afd852799f9906ea.pdf
    • https://static.usrfiles.com/ugd/5cf23b_f17a5de8d8a94dfdb514a6a7da6f87fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6c945ce8ca462986d5ccd3d3f84bf6.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
font_00_sfnt_off00007fc8.bin
2f7b79ccd0a3ff6c84b106161407a8ffab6609239cdefb5f330b961cbd089263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC8 4240 bytes
font_01_sfnt_off00008e17.bin
40d90fea0b736e38f9d7f468c9d086f0b0f176726516f7ac70e8165f8a51a8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 10228 bytes
font_02_sfnt_off0000b106.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 4324 bytes

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