Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38fdbe71e82a006…

MALICIOUS

PDF

48.5 KB Created: 2020-08-07 06:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c77bbfe00e0406e144485b0d09fb4a SHA-1: f44b4dd4ca2351f85224cbd91fe843b456470e42 SHA-256: d38fdbe71e82a006840fee6ac93041a59f75e7fb27bd5f3db4a46f99c39922ae
120 Risk Score

Malware Insights

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

The PDF contains a mass link farm, with a primary link pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=errores+gramaticales+pdf', suggesting a lure related to PDF grammar errors. The presence of numerous Shopify-hosted PDF links indicates an attempt to obscure the malicious redirector and potentially leverage benign-looking domains for distribution. No scripts were extracted, and the primary malicious activity is link redirection.

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/pify?keyword=errores+gramaticales+pdf
    • http://files.rivertowniga.com/uploads/1/3/2/8/132815298/nekuvugokoridumazagi.pdf
    • http://tekoxinif.insulators41.com/uploads/1/3/0/7/130740069/b20773dc9cb716f.pdf
    • http://files.rileytimmermusic.com/uploads/1/3/1/4/131406841/nafimasojuvuz-kedas.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/26714933586.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/60446638607.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/90735709657.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/96122550973.pdf
    • https://cdn.shopify.com/s/files/1/0449/8666/3070/files/ordinal_numbers_in_spanish_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73881495537.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/54768232216.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/japedolirexofimakaloridu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/38329808549.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/juxitegigisoxatukewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4432/files/52955066199.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5460/files/83466188978.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1292/files/28063914969.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_off00006d74.bin
a8656ed7c12adf934c0dea7d1b75efacb2ac56cc70ba3c216f2685fcec958d28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D74 6440 bytes
font_01_sfnt_off00007d65.bin
9acaf4360a1aabba7c877bbe4e6ca904648769e396eecdf18e67c5c268100afb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D65 5432 bytes
font_02_sfnt_off00008fcb.bin
cf31b23048a0dfd3eb3c5c43bb652c01e5ff55ba6b0e56ddd88b2865c94aeedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCB 11296 bytes