Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff59f8b0b2508dd4…

MALICIOUS

PDF

77.0 KB Created: 2020-08-31 09:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62178d337febdbb859aa35b83641ccc SHA-1: 1f66423723a17c7660918b6ac2712ea6ba9a1064 SHA-256: ff59f8b0b2508dd482f1b71fa638b01a9a9905fe735c049c1f8f599d9146dd2d
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links to other PDF documents, a technique often used for SEO manipulation or to host malicious content. One of the primary links, 'https://ttraff.ru/wix?keyword=planets+and+their+symbols', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the link farm and redirector are strong indicators of malicious intent.

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=planets+and+their+symbols
    • https://static.usrfiles.com/ugd/cbe7f7_7fc44768bc4f4ac498c90f0a32654f2f.pdf
    • https://static.usrfiles.com/ugd/7ff653_68d3f18d342e4e7fb55dfcc1805cdae6.pdf
    • https://static.usrfiles.com/ugd/b8c837_042ded1c11234268b377a95cc34b3e07.pdf
    • https://static.usrfiles.com/ugd/105a8c_8e99c5374aa64c4a8301a2cce0865bc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_356230d3c3694ca8af539d8cba9a1ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_75560a67bc894a448044a18ddd58077f.pdf
    • https://cdn.shopify.com/s/files/1/0461/4268/5337/files/wong_s_essentials_of_pediatric_nurs.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/11613948353.pdf
    • https://cdn.shopify.com/s/files/1/0429/3620/5479/files/r_a_f_ki_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/larozofazakozoderemituvab.pdf
    • https://static.usrfiles.com/ugd/b8c837_01dff94f677c43b0b26f763c251e3641.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5e8d0f10240461e9b98d1a2b99c762d.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_a42759cabcb541f7a59d530e66abf6e2.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a69f.bin
9a9bb348e0972272d38ce5ce0fe78a638f1c59ed098ac67cfbd4a96279ed088f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA69F 6640 bytes
font_01_sfnt_off0000b75b.bin
e8ce7e78b70b8d7c68f1f2c2206dbcbb60ee5719dc3ebfff64676cc1c37c0c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 5308 bytes
font_02_sfnt_off0000c926.bin
24b76b79032e2de84cfe1e50e8845295fe746d678b809bbd9692570b043c9d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 1760 bytes
font_03_sfnt_off0000d1e4.bin
4cc480445d7c31ee252cf80c362abbd4e75f75435fe020550047d198b87b5087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 10788 bytes
font_04_sfnt_off0000f71e.bin
4ef434166547db497a17d725bbe8ea8450869abf797f8efcaee967d1d5daea24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 24872 bytes

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