Malicious PDF — malware analysis report

Static analysis result for SHA-256 8805495a53e0c4ab…

MALICIOUS

PDF

33.0 KB Created: 2020-08-23 10:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db4ab0d8fa303a9b4d68cca93f9a82d0 SHA-1: bc9e64cedebd762c3063896d0785df17626cd9eb SHA-256: 8805495a53e0c4aba30042c6f37f40edd259e635bd705fc48b0044790a3ff9db
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc). The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search results or distribute further malicious content, potentially as part of a phishing or SEO poisoning campaign.

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.cc/pify?keyword=imitation+game+soundtrack+piano+sheet
    • http://tategi.carolwooten.com/uploads/1/3/1/4/131452836/vagiredemubepi.pdf
    • http://pijatiruw.vrugginks.com/uploads/1/3/0/7/130775451/sizoranowafuku-liveto-tafasobike-zafaride.pdf
    • http://lerud.reedley4h.com/uploads/1/3/1/4/131437792/tuwumojino-wezop.pdf
    • http://files.bestoftimeswatch.com/uploads/1/3/1/3/131379749/e4facd24be.pdf
    • https://cdn.shopify.com/s/files/1/0439/3218/8840/files/dogilasenepap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3702/files/bug_report_redmi_note_4.pdf
    • https://cdn.shopify.com/s/files/1/0438/4237/1741/files/75233300393.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/14991864652.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/chivalry_medieval_warfare_ps4_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7808/files/25421626012.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/vuwagaburikozozelidenefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/ni_no_kuni_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4928/6813/files/algorithms_and_data_structures_book.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_off0000457b.bin
783939f5302f6e730d6a5fcb5370a3de4c977a3ba57ce3c6b450747ef7e94279
pdf-font-stream PDF embedded font (sfnt) at offset 0x457B 5456 bytes
font_01_sfnt_off000057d6.bin
8c6bb3d299ea72ed8ab96dfaf5b5d0a9432e26b5b6870a570a4d1b49cd9be7ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x57D6 9236 bytes