Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1038f27307f7021…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 20:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acd7702b12baea9d712f80a69bca987f SHA-1: 4b3115d4115d951524ac7f13e24e34ccedf61ed6 SHA-256: d1038f27307f70219e10b4f970bab1c604a6616a122a1dcbe22722c77f7aebd0
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used in link farms to manipulate search engine rankings or to distribute malicious content. One of the primary links, 'https://ttraff.club/wix?keyword=how+to+get+umbral+mods', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=how+to+get+umbral+mods
    • https://static.usrfiles.com/ugd/2ac701_5aedf950269a4d87a5dbb0bc7f4a86c3.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_806f563195c949b09fd736ef2d03f117.pdf
    • https://static.usrfiles.com/ugd/b8c837_b15d50d21fc74e01b4827209e2ba98de.pdf
    • https://static.usrfiles.com/ugd/fac845_e035081f619643f0b9144178989641ae.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/24137276544.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7725/files/katiziji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/windows_server_administrator_interview_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0734/files/vemelurixanomipojode.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/724693027.pdf
    • https://static.usrfiles.com/ugd/b8c837_2144100e9be34a09ba9a82ea531e3fca.pdf
    • https://static.usrfiles.com/ugd/fef806_40b64afd24a04162b55a9a115043f3fb.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_off0000606c.bin
a122fcfe6efd6b395baff4906c4c71289fc580f69c38f8139d267a440bb8639f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 5068 bytes
font_01_sfnt_off000071be.bin
658774b28f0c2ed55a3e311fa3c61c3f9cbb10c496104f1c6b9bb837d881d333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 10424 bytes
font_02_sfnt_off00009543.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 4324 bytes

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