Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d09bbcd1e11c12d…

MALICIOUS

PDF

63.0 KB Created: 2020-08-31 11:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda31c6381e419c99bb1f532d10da5be SHA-1: 0641584146790c94e9f22c23501b4389c6246e63 SHA-256: 8d09bbcd1e11c12d9c3810e5fcfa18380528cc5ec232923776199cc0ec5f730c
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=skeleton+sitting+in+chair'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which point to 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL.

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.com/wix?keyword=skeleton+sitting+in+chair
    • https://static.usrfiles.com/ugd/824332_4e454798bc894c8685d56be5faec9e4d.pdf
    • https://static.usrfiles.com/ugd/38bf1f_92e96a9968894a5da898a1dea7dcb652.pdf
    • https://static.usrfiles.com/ugd/5899d5_18ace01941a64a2d9ef6add1f90da059.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8001a335954c0597ff760a643b0b0d.pdf
    • https://static.usrfiles.com/ugd/73cb9e_b8d998976a1742e699ff7ca4c8966ff4.pdf
    • https://static.usrfiles.com/ugd/804ff6_8a8a6f2abdd0423ab0c36870825f5d08.pdf
    • https://static.usrfiles.com/ugd/4826f5_d89474d6a66a4ed4b0aba8560a98e5a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_cae205891ee14df2a6350cbbf637fad2.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/viduxekeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/2010_ada_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/wemak.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6e593227de4e2e8719c2da2bdf19a4.pdf
    • https://static.usrfiles.com/ugd/739437_cbbec43a78bc4960b4d3d84d7c6f25c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bd0e40eb6e04721a88f651f4d4435b1.pdf
    • https://static.usrfiles.com/ugd/225520_04f040d074a24e1e8764502599ffc9f7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://www.alamy.com/lic
    • 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/
    • https://static.usrfiles.com/ugd/b8c837_cae205891ee

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009909.bin
73350216ca4194e08862f4d2cb6217b2e43346f55e59feae187a379f704fbeaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9909 5228 bytes
font_01_sfnt_off0000aacb.bin
1a801823aa9de38f2dbd71196fa1eff25bbebdc150643982147053c99f836b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACB 14160 bytes
font_02_sfnt_off0000d794.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16204 bytes

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