Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bd8e99630988fe…

MALICIOUS

PDF

35.2 KB Created: 2020-09-08 17:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09bcd550f1c7ba5df73f4d238ab0ec30 SHA-1: d73e093b87e5d6e9105eb76f956824efd8954ae0 SHA-256: a4bd8e99630988fe8ba2e330d9a2cc4a8deeb2081d0d5b6a2c885c8cdc45c0f6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.me/wix?keyword=havana+que+sera+sera+song'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including the malicious redirector, suggests a social engineering attack aimed at luring users to malicious sites.

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.me/wix?keyword=havana+que+sera+sera+song
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/picture_description_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/types_of_capacitors_and_their_applications.pdf
    • https://cdn.shopify.com/s/files/1/0435/0764/6630/files/tipedex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/kojil.pdf
    • https://cdn.shopify.com/s/files/1/0460/1102/3519/files/wemixikupofuvuviwajidevij.pdf
    • https://static.usrfiles.com/ugd/011e4b_829de3562ffe4c5ea98b7f3355a7ecb5.pdf
    • https://static.usrfiles.com/ugd/5ea4d5_07ed98ec6a0f42349a5f326fc4005152.pdf
    • https://static.usrfiles.com/ugd/576447_7cb1a0e3e25b468a97d3a78af5b7bc50.pdf
    • https://static.usrfiles.com/ugd/628a76_4208646bd79d45bb84e950676723c998.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_6994511bd203489c93add54cfec8628f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b06b5aaf1a4144489b5c9a0afeb24d87.pdf
    • https://static.usrfiles.com/ugd/eda9ba_9de6e4770e12492fa015d2e784c25971.pdf
    • https://static.usrfiles.com/ugd/2ac701_6f2174a038ef4a439323785230393a05.pdf
    • https://static.usrfiles.com/ugd/0251f0_2d5b3ffd1c77463091b5eb3a8d98f81a.pdf
    • https://static.usrfiles.com/ugd/96564c_f9863b9ca795430bbe39bab0e17c20fa.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_d31492b8315e46c18c756f7ebc722add.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_off000048ea.bin
8a670b6195597ffec52ea7fffa503cc254622d204d3b7394bfc900aadae2bcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EA 4968 bytes
font_01_sfnt_off000059e3.bin
ae6f368cbf626fdec10e28e0c8458ce74f40ccb63bba518d6187726be386e5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E3 11136 bytes

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