Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436995caa0eff8c…

MALICIOUS

PDF

51.4 KB Created: 2020-08-31 20:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269926860608ef334c7872c32d4d7aab SHA-1: 75a7e6135f4cc3cf2f14a16bc63301fd351a48d3 SHA-256: f436995caa0eff8c843e3ddfbfa53b7ffb26ef46af70ba000b9dd11bc18cdd65
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cowdray+park+golf+club+course+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which lead to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirector URL and references to 'cowdray park golf club course guide', suggesting a lure to a malicious site.

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/pify?keyword=cowdray+park+golf+club+course+guide
    • https://static.usrfiles.com/ugd/24853a_f93650b13798497e8ac9acd35ca05d79.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60093e7798a448c8da43e3c348c9671.pdf
    • https://static.usrfiles.com/ugd/b8c837_086d2536974f4e30a82be9872f82ec84.pdf
    • https://static.usrfiles.com/ugd/b8c837_113321a4240248e5a9ef02794b89c394.pdf
    • https://static.usrfiles.com/ugd/b8c837_5aa99666413049e5ba5b3b5bb0c49d1d.pdf
    • https://static.usrfiles.com/ugd/0df15e_0be82cb2275e49f28c2c65964a7cf545.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa25e1f126944930bdbefbf180af2a56.pdf
    • https://static.usrfiles.com/ugd/191a6d_215f6ee216fc4bf58e29054f67432b56.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/hydraulic_tube_bending_machine.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/jeneriravipadizu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/lizotegiwepe.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/jugujikuzukefoxamimelo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/34928982376.pdf
    • https://cdn.shopify.com/s/files/1/0434/3188/6998/files/jacques_de_mahieu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/60377742927.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/tizodexefewuwawal.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_off00007b43.bin
d93bb5bbacf4257538aa5f75f15c0b9d66ed098023db7d0573ab6c22aa7b75da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B43 5440 bytes
font_01_sfnt_off00008df4.bin
1f14ab0c3a60c680c62533cb17c4a241feec6e64f9997b9a339403200a16047b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 10896 bytes
font_02_sfnt_off0000b237.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 4324 bytes

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