Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ebfec6ac50ddb1…

MALICIOUS

PDF

40.3 KB Created: 2020-09-11 16:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028625ef3b373ee1b086a35130fefeb2 SHA-1: d1cab50819bc72a972d347f7f1f96904b0a8b1f5 SHA-256: c8ebfec6ac50ddb1461c4adfd464d4b1c88934071e845564b27930a45c488fee
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=yuumi+champion+guide'. This URL is presented within the document body, disguised as a game guide, to entice users to click it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on static.usrfiles.com. The ML classifier strongly indicates maliciousness.

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=yuumi+champion+guide
    • https://static.usrfiles.com/ugd/0c4177_3148c7a2a4f545e4b0af931ff403deda.pdf
    • https://static.usrfiles.com/ugd/54bec1_0ad603d23ba84aecb11c3684718ffab1.pdf
    • https://static.usrfiles.com/ugd/78c764_23073db398e641b7945bc14b8379292e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/free_bootstrap_templates_2018_dashboard.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/lupukifusijisexomibatokij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/98234208113.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/pevezulaxolej.pdf
    • https://static.usrfiles.com/ugd/868f76_73a6c9ec356e450a8a539ea41311e3f7.pdf
    • https://static.usrfiles.com/ugd/74a852_bd8de3d48d3445aeb3b94f3add67e9e0.pdf
    • https://static.usrfiles.com/ugd/31593d_3346ee2f992145b5a2a7e491855a001c.pdf
    • https://static.usrfiles.com/ugd/3bca44_059aee9b293c4080900014156cdf85ad.pdf
    • https://static.usrfiles.com/ugd/834936_1cfa6225b630414e9b7298e569424669.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d2b3fb03a4b4654a2d4e25a41b8e4d2.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_off00005fbb.bin
75760307d7ca7dee9b07e1c13fc61be5eee860132285d13e3fe8cb059dfdd57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 5140 bytes
font_01_sfnt_off00007114.bin
12dfb37840317e8261b10b25d1c0ce95718a10ec7bc0c2c9de89b6eada919ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7114 10552 bytes

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