Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8c14a2833bd170…

MALICIOUS

PDF

35.8 KB Created: 2020-08-29 20:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2967e1b886e6c124e186e25ed5b4c09 SHA-1: 3c2b07e08e7ad9de523e2444a282b066764ba9ed SHA-256: cc8c14a2833bd170e638cc33544f8b63ab3c228a25eae6c183d7d9134da435d4
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, a technique often used for SEO link farms. One of these URLs, 'https://ttraff.ru/wix?keyword=homelite+ut10580+manual', is identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector and the link farm technique are strong indicators of malicious intent.

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.ru/wix?keyword=homelite+ut10580+manual
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/13213945096.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/tuwogonobosutimamo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/56743526257.pdf
    • https://static.usrfiles.com/ugd/b8c837_7807c67147024923a9a68799d7abf13d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd4141fcf85948148f7b269342f39ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f035972904dc4f688e7143e1609cbd03.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07415cb6f844e31a99903a4f6f3421f.pdf
    • https://static.usrfiles.com/ugd/8d57bd_17ee77f4d78f4955870d39e659de708e.pdf
    • https://static.usrfiles.com/ugd/b8c837_37196bf6334d4812a167b5876e12accf.pdf
    • https://static.usrfiles.com/ugd/b8c837_01f2fd2444b2434586ba0b0969919ead.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8167/files/88689749148.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2103/files/jirotoxupupadiwimusozojuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/integrated_aquaculture.pdf
    • https://cdn.shopify.com/s/files/1/0434/1707/5868/files/42941327877.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/adobe_indesign_cs6_full_crack_sinhvienit.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_off00004e3a.bin
a792d52ce1b9aa63ffe181deb669d6b5ab388a01893f6d1b317800298445fc61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3A 5028 bytes
font_01_sfnt_off00005f4e.bin
73859c8a05e2c4de6c67d36469966d6e3934f9dcb70ed106c90c7f174eb3e72f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 10452 bytes

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