Malicious PDF — malware analysis report

Static analysis result for SHA-256 5395939a95b876fa…

MALICIOUS

PDF

43.9 KB Created: 2020-08-29 18:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5be9b307af109f4e250e8ceaf06a6c SHA-1: 853c1811f1fce40d62d95f825da76d6e46e78b94 SHA-256: 5395939a95b876fa3bbeb026f37f8714b7c09a9a200ae7a59bebba435a5f2246
152 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical redirector link pointing to 'ttraff.link', indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a lure related to 'towergirl kingdom conquest' leading to a malicious redirector.

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.link/wix?keyword=towergirl+kingdom+conquest
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6ad61f936d94ad3adb040cc354857b9.pdf
    • https://static.usrfiles.com/ugd/913720_3906613f6ac148e78309f1b7cd371c26.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a911e26fe49407cb70aabc445ede21a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e71e2132e20b4d69be56b8fe8620941c.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/red_black_tree_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/62999910863.pdf
    • https://static.usrfiles.com/ugd/b8c837_971cae0d2cc5406592ac830d7adbe1f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b95319742df47eaba7bfbfa41b2ac84.pdf
    • https://static.usrfiles.com/ugd/353d00_e8568d186b9047cfb79338616b12cab4.pdf
    • https://static.usrfiles.com/ugd/b8c837_70c57db51c4244df93590711178b9b6b.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/nezasoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/603214262.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/zatasilajifijezexifuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/84462129027.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_off00006128.bin
4cd24b0f9e0aea6f8d24589c452799cb939e99786babf3e0d98df3ea0cba891f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 5280 bytes
font_01_sfnt_off00007310.bin
9ae762cc62501648a5b03d6966662b2a681bd0858f1cab3d50a0f6d88b9ae3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 14768 bytes