Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad8cb2096f65e89…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 00:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f239c72f06cd13d588e9a6f4e399bce4 SHA-1: 2ba999affd771916203508f58ff5599aebf93c6a SHA-256: 8ad8cb2096f65e8966eba487d581c4594161e9b972a61a8b5079418f7e930659
152 Risk Score

Malware Insights

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

This PDF was flagged as malicious by an ML classifier and contains a large number of embedded links to external PDF files, many hosted on Shopify. One of these links, 'https://ttraff.ru/wix?keyword=sadhguru+inner+engineering+toronto', is identified as a known malicious redirector. The document body contains garbled text but includes the same redirector URL, suggesting a lure to a malicious site.

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=sadhguru+inner+engineering+toronto
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/ncert_english_literature_reader_book_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/15073699930.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/13382771110.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/jonati.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/kopudipeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/ditigufabibexabotikomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/lepuxijekeveropizim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/ccna_routing_and_switching_200_125_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/refractive_index_problems.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3563/files/phonegap_camera_example.pdf
    • https://static.usrfiles.com/ugd/b8c837_a75c1289e77441db9a73ef385d36c22b.pdf
    • https://static.usrfiles.com/ugd/3aca14_eb5c820440824f8384282d90e95ddab9.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_off00006a2b.bin
059ea362906995ac0dbb50080a709c63c3dec7a32aeee0446151c458ec9fd4af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2B 4980 bytes
font_01_sfnt_off00007b07.bin
a8aecc6487e39e8fd24ae5ce027b5261114606f94aecd7b53fea4bb8256b679f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B07 10864 bytes