Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff453853c47c26a…

MALICIOUS

PDF

36.9 KB Created: 2020-08-29 15:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cc81f12e70707dcb06aa015037a2932 SHA-1: 440423ffaa27e11801bc6f69ee816648dee7d3f2 SHA-256: 7ff453853c47c26a94d9d260aaaf5108594fcca3c248e3c79075f31c6ee2b450
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to a 'music download' lure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to host or chain to a malicious payload.

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=two+biddy+music+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/xonumu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5689/6920/files/early_reading_skills_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/2068/8282/files/75371361812.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/ccna_routing_and_switching_200_125_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/47950481956.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/wozofanag.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/14080566458.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/wizevatokar.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/wojise.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe0a17260b16451dab778b2de929a7bc.pdf
    • https://static.usrfiles.com/ugd/10b11f_6688515fa01542d6b4bc07775fd4802e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1638111e37bd4c80b3b30bbc8a6ccb82.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b617370c43ad47229a90c2b3610463ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_abed50adfac84b17b3d864ce97c2373e.pdf
    • https://static.usrfiles.com/ugd/b8c837_44121cb3184d4762b3b64512f465a8bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c91a46af93c4a119108b1c0c0b2fed8.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b7.bin
19db3ff6adad24bb4764241edef54559cb7a5e34eba6fa85eea0485b55c8f726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B7 5272 bytes
font_01_sfnt_off000062a0.bin
21f1f0484408f3f39cbc2e4e447055a8a9ad5da0c5a1789f59dc1ef80ddb650c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A0 10536 bytes

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