Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ac1134e8c2ee2b…

MALICIOUS

PDF

67.9 KB Created: 2020-08-29 09:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e606f4c15e923c276e99701b99d33fc8 SHA-1: 8101307ee94b0af2a313fa3051e710700aba92af SHA-256: a9ac1134e8c2ee2b3988cae483640a66665ccaf19a9d85f92f538ca23f284e38
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=pregnancy+and+postpartum+thyroid+management+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on 'cdn.shopify.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the lure.

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.ru/wix?keyword=pregnancy+and+postpartum+thyroid+management+guidelines
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/rogifedusukenewof.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/resuvedowasefusujesevivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/33499255806.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/2060406594.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/60025545889.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/nenokigilomezerikar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/nuzivuzulerunilinepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/teruweno.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/electronics_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://static.usrfiles.com/ugd/b8c837_176043b66a5943edb306487a38132a78.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee97749bb1d04e2f90c42d5872c6ea91.pdf
    • https://static.usrfiles.com/ugd/b8c837_077be8bd44074cc59e5e93c322d316e4.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_off0000b617.bin
b1d94ffeac3d6994072d76a5b09c340dedb426c981f0451ef35863b2f9419d20
pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 5588 bytes
font_01_sfnt_off0000c8e1.bin
b990a81f4d2e0264a33dab586ef3d62131b70ffe76679208a1c8dace5ead78f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 10296 bytes
font_02_sfnt_off0000ec3f.bin
8596d51a523124fcb1950bb0b7033b1d9054ead7d937a3136e05175fcc3fb7d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16272 bytes