Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c135c1d9d8d3c29…

MALICIOUS

PDF

40.1 KB Created: 2020-08-29 20:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5818576c8a554f01f568057b4abacc SHA-1: 9c041926b8f6fe263af28fe15b45bec5e4ab4440 SHA-256: 9c135c1d9d8d3c29941e09bf8db3d81bd71fb12b780f0f95bf56a5d331a1ef54
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=world+of+warship+stats'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly supports the malicious nature of this PDF.

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=world+of+warship+stats
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/gafarobuwajaruvupizos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4243/0362/files/25156208370.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/xezini.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2168/files/aqw_le_bot_8.4_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_de634ada4f454ed1aa0ee8463617ecf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dff7c2f01dfb49fc867614780af3b1a9.pdf
    • https://static.usrfiles.com/ugd/89064d_272fc7693dca40fd8dada6485f99dc38.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ac3770fcc0410eac93eacff9e17f07.pdf
    • https://static.usrfiles.com/ugd/b8c837_3192a14a0fbe4f5593de9274581fa9d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a92d42216cc743a0b9f5fe05ed83bb02.pdf
    • https://static.usrfiles.com/ugd/b8c837_d338ef3bfea54650b258c3a3c51d4b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_8561ea4ef212406ea4f6aa3007d15b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a5f92b248f644aebb64990e07b4a0b4.pdf
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/36063153576.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/wesoluf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/17567753498.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/zubururifobolotupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/wunoxewewuwovofawikoseni.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_off00005cd5.bin
405b66290a39fb294ff86da1bc0f2d5e9d5e420c5b275e095b65b6d565403790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 5232 bytes
font_01_sfnt_off00006eb8.bin
4caffa5d06aafd3e20bfc54a61eb7dced42121b54a1c77f56e28b3ca587e80b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB8 10600 bytes

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