Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f28b304e5f3a397…

MALICIOUS

PDF

66.8 KB Created: 2020-08-31 22:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb7d3df54277e0dcac80e95ba7f1d62b SHA-1: d8ad08c088e421ee356833439f3b889855064aa0 SHA-256: 9f28b304e5f3a39715662e6b0caa530d143744342de95ebbd1bece3f1661486f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=wow+bfa+boralus+guide'. Additionally, another critical heuristic indicates a PDF link farm, with the first URL being 'https://static.usrfiles.com/ugd/7a11b0_b030ba3b11074893b2ab0be873aa7b5c.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=wow+bfa+boralus+guide
    • https://static.usrfiles
    • https://static.usrfiles.com/ugd/7a11b0_b030ba3b11074893b2ab0be873aa7b5c.pdf
    • https://static.usrfiles.com/ugd/87a178_c41a4ae79e464dae90e68b191f491dff.pdf
    • https://static.usrfiles.com/ugd/1849a1_258548b455a843ab9c889b7c24303e6d.pdf
    • https://static.usrfiles.com/ugd/f3cb45_b024dd5e29c34a5dbca03ee7f9b228e7.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/zabavegiloj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2028/files/zisivonodimipeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3832/6432/files/53315245864.pdf
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/yakuza_0_softshell_turtle.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4677/files/73208387097.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_da7f8334da1442c08eec5db475900f23.pdf
    • https://static.usrfiles.com/ugd/ce77c6_315bcf0fc9344c81b6ad3e985f1fde81.pdf
    • https://static.usrfiles.com/ugd/7d21c0_16389b86203f4f8ba9727999681d5e65.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab3be8455ee450fb89a4cae7159f6a4.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/farm_theme_birthday_sheet_cake.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/how_to_make_html_games.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_off0000c76f.bin
13e664fd40b756ba8673e4553875792f2567a4750a436707842c499d751dec09
pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 5320 bytes
font_01_sfnt_off0000d9ab.bin
c66a8cc096a915b4e6951523d9aa377572d7df90ed30651528dd11e1e6b38da8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10672 bytes