Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cab8b975daba68…

MALICIOUS

PDF

79.9 KB Created: 2020-09-23 07:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc09ee23c3d088a3ea48495884919653 SHA-1: 5cd533bcd1cd375468c8a01d721035b53386582c SHA-256: 13cab8b975daba68f5b11dfaa1afa748942628fc30b7a2b0594e5d253a3e1e13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to a redirector URL known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=yukari+persona+arena
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d17cccd1-69e0-44fd-a685-d495f634691c.filesusr.com/ugd/87b9a8_346fb7d11a7849ed8ea7d99e1ab45aee.pdf?index=true
    • https://b037a5f2-35d4-42d2-a608-a087a1d6958e.filesusr.com/ugd/5360f8_13d15e99dfd64d32b3d3b49c99a211c1.pdf?index=true
    • https://7ed5fd2b-5e59-49f6-a3e3-587900edd4a2.filesusr.com/ugd/b7306e_6d6449c981d94265af9748321864be0e.pdf?index=true
    • https://bc326c61-fdfe-44ac-ad31-ebd999aff05a.filesusr.com/ugd/fb41f9_23813453691d4bf1bc870b602e22c065.pdf?index=true
    • https://7e812244-aeaa-4c94-8c63-c5cbee115052.filesusr.com/ugd/bcc0e4_5f2272510f8f43c2934d16126efa8ae2.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/always_hungry_diet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6642/files/the_knight_s_tale_by_geoffrey_chaucer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/spybot_search_and_destroy_download.pdf
    • https://cdn.shopify.com/s/files/1/0467/8002/2937/files/the_mechanical_design_process.pdf
    • https://14a8b3a2-7617-4de8-8833-2ac8b5288bdf.filesusr.com/ugd/ea2c45_edb288fc2b354639b1116fb20d001fd8.pdf?index=true
    • https://1986aa91-7ae7-4078-8c8d-dafca24952f0.filesusr.com/ugd/e2f197_ccf845bff988405ca3aa4b7e0a035a87.pdf?index=true
    • https://324fd698-2b44-482f-8884-fe314b112224.filesusr.com/ugd/e2f7e1_233f4e1aa0f84eb59756aac6f2476aac.pdf?index=true
    • https://1a01425e-0ce4-4873-bb86-b94ba1be8b13.filesusr.com/ugd/4bdc6d_20797ea332234b9e9c68383263888cb8.pdf?index=true
    • https://be2acf96-c53d-425e-bffe-b522d73a81a9.filesusr.com/ugd/6c98bc_6c42bb23353e4df391961381b20e409b.pdf?index=true
    • https://fa670546-b679-4a57-a88e-9cba6bda00af.filesusr.com/ugd/60e703_c5cf8366d42b409da97e0091c3f044f8.pdf?index=true
    • https://e998eebc-3532-442a-a171-9a023a689e4a.filesusr.com/ugd/906e9f_08d3a49800ed48199b2e7edef9aa86a8.pdf?index=true
    • https://ca4d7c66-e601-4357-921b-6b7b727a051c.filesusr.com/ugd/ce4b7c_7349c640f8a5413ba2ae79c3b8dddec4.pdf?index=true
    • https://081378b2-4b28-46ea-ad53-ae1027b2f140.filesusr.com/ugd/e3c460_c3f089b6f81d4683b1d54e5043a3b0fb.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b427.bin
41804eaa24c3e1a8070868872050992985b5480358f9f43135fa23c0ac02ad03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 23148 bytes
font_01_sfnt_off0000fc60.bin
777abbe9666b8facf624b205a37fb51078c486c9265e32e41d67f4cc747e1bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 4804 bytes
font_02_sfnt_off00010cc7.bin
9be42ecb7f6595cd141ce298aee840f4806e081d7f34a5e2e63c46e2ab22876c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 11340 bytes

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