Malicious PDF — malware analysis report

Static analysis result for SHA-256 a566a51572d25e3b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 00:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f0ad106ac0961822b4fd65d4b34115 SHA-1: bd5b366c7e14d00378480baed5fd1d63e8b6d27a SHA-256: a566a51572d25e3bb457635ec9a2300c76ad86e34901e68539e7214e1bce23bd
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to a redirector. The primary malicious URL identified is ttraff.ru, which is associated with malicious redirector infrastructure. The document body itself appears to be largely obfuscated or contains minimal readable content, but the presence of numerous links suggests a lure or redirection mechanism.

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.ru/wix?keyword=etica+y+responsabilidad+social
    • https://static.usrfiles.com/ugd/d9d1f5_43203f877da64dc3a3f4cd028f0f28bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_77c975ca356f4feab207798eb7a5a9c0.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_effd7d31968943f38fd9c77e1e711f60.pdf
    • https://static.usrfiles.com/ugd/a01749_6a191d0d6aba49e8a8d360eae51a24d6.pdf
    • https://static.usrfiles.com/ugd/544c7e_0f27f608a79544f4bb5c8d4c829f253c.pdf
    • https://static.usrfiles.com/ugd/e4ff69_35f77cd65cce4e9cbe01927b248aa448.pdf
    • https://static.usrfiles.com/ugd/affaa6_c69ecdf4ee9746fbaad857dc87c9e9ab.pdf
    • https://static.usrfiles.com/ugd/067ecb_290db126429046abb99c49d372235a31.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb2c15093a80485a9d851f595bd3b2e4.pdf
    • https://static.usrfiles.com/ugd/daca0d_81b30b331b5f4f2d9c54cc054a164301.pdf
    • https://static.usrfiles.com/ugd/dad90e_c6f7e4989ac84aa4adc27b7138218670.pdf
    • https://static.usrfiles.com/ugd/b8c837_58b5d391d825494a9a8833891b854cf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e824070f6e1745b1bfb4cc3cb22c099a.pdf
    • https://static.usrfiles.com/ugd/ba3095_691b023f5e504089af330f916db5bf60.pdf
    • https://static.usrfiles.com/ugd/b8c837_632b364a7a88422b98969ff5ccf9022e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a3ad819ca7040918230151a692985cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfed0368144b4d54898b2bde364a1518.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.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_off00006d44.bin
39c63151ffd445b3b0d2ffda41cd7713171c8a6f8ea3566039a8747cd5de137d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D44 5264 bytes
font_01_sfnt_off00007f2f.bin
753056406d2edb5e89d3b5f520e560b66dfd23ce3b9195d111f4e638c82d7984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2F 10984 bytes

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