Malicious PDF — malware analysis report

Static analysis result for SHA-256 9452a7fd0c6439b2…

MALICIOUS

PDF

39.6 KB Created: 2020-11-01 21:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9007bdc7b67b083c8c9621bc4b8ba514 SHA-1: 1eabd60b9a2a338cb6fbedbbe76e35d007443d57 SHA-256: 9452a7fd0c6439b25df4f7a9068b62adaf7c2e05c680e9ffed6cc166985fbdf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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.link/123?keyword=966+area+code+located
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f8a5407e85fc.pdf
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5f9cd23320f96.pdf
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/3430505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf7e14fb-9953-4a05-9797-ab553ce588ab/36511072804.pdf
    • https://cdn.shopify.com/s/files/1/0485/2609/8594/files/difference_between_process_and_thread_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0485/0185/0273/files/r.j._black_falcons.pdf
    • https://uploads.strikinglycdn.com/files/f24e348b-cfb0-4176-9982-4db2b6ee8c0f/81215742636.pdf
    • https://uploads.strikinglycdn.com/files/9936bacf-5760-4fc8-8360-9bcea60b2fbe/19048581650.pdf
    • https://cdn.shopify.com/s/files/1/0497/3566/3767/files/63657858745.pdf
    • https://cdn.shopify.com/s/files/1/0498/7509/1614/files/turbo_driving_racing_3d_game_mod_apk.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db2.bin
5ddb5dcfbb9f53de21c7693fb32d0841bc9e67516ffa4df863f4a5876f4ee33c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB2 4972 bytes
font_01_sfnt_off00006e9a.bin
24d8311caa43495659529cdd959e8ebdb9f42ac9c4909f9cbb08fbf46f88fe7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 10356 bytes