Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac5faac6e8a922…

MALICIOUS

PDF

42.7 KB Created: 2020-09-04 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e720c89724e9f5ec0afde772e0b3e6de SHA-1: 77f96cf9594161cd8fb9c31828df16d352a6a2d9 SHA-256: d7ac5faac6e8a922fcbfb3f8777d0e6b2dc70e81befae91c88ab14913eda5cd5
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector at 'https://ttraff.me/pify?keyword=jogo+cavaleiros+do+zodiaco+ps2'. The document body, though heavily obfuscated, contains text related to a game and the malicious URL, suggesting a lure. The presence of numerous benign Shopify links alongside the malicious one is a common tactic in SEO spam campaigns. The ML classifier also strongly flagged this PDF as malicious.

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.me/pify?keyword=jogo+cavaleiros+do+zodiaco+ps2
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/big_data_analysis_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0436/9773/3787/files/19199589159.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/84047650600.pdf
    • https://cdn.shopify.com/s/files/1/0460/1472/6311/files/cm_14_for_yureka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/2287125341.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/breeam_communities.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7dec993685842a59996048e02d31b77.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d77500cd1d46fa8b209575995d7c32.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2bbc7df612f44b98b4b924f4a1a7a61.pdf
    • https://static.usrfiles.com/ugd/a4e402_a0cbcded8f084128b8d6c7cc48874629.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/static_banking_awareness_by_affairs_cloud.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/sabatedonubikejaris.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_off00006491.bin
feb8d37ba9067551829e8f9e2fa9b26a92c7552fd78c16d7940ce91c8a195ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5472 bytes
font_01_sfnt_off0000774f.bin
867ba91cadf70df9996b0abb46cc70aba5bb5facd72d5dc4ab931bcd4670454c
pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 12364 bytes