Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed21d7a8b6eeb43…

MALICIOUS

PDF

40.9 KB Created: 2020-09-02 00:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da127c9c6003faa03364ed7d5812df3 SHA-1: fc7f520f3e8e108a48101ae63f590598f3d73509 SHA-256: 8ed21d7a8b6eeb43893356017c1ee2e36684210a234e2444f30d96d992215ab0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains numerous embedded links, a significant portion of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed 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.ru/wix?keyword=drenagem+linfatica+manual+passo+passo+rosto
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/wusiman.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/ruzemipalowopisagifuwozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/all_in_one_er_latest_version_apk.pdf
    • https://static.usrfiles.com/ugd/6846fe_8fbf9cf5c0974756a56281cbb769eeb6.pdf
    • https://static.usrfiles.com/ugd/a107db_495029dd0ed444cc95f65f6abe8946be.pdf
    • https://static.usrfiles.com/ugd/909b15_009e8a8b7a0f4d00ae80050a30fe2eae.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f5505025d5b4854ab95cd8b73e34d04.pdf
    • https://static.usrfiles.com/ugd/756799_bf75f8609dad4504839277c9b774c7b7.pdf
    • https://static.usrfiles.com/ugd/7041e4_03795fa13cf94d85946369c82edc09ac.pdf
    • https://cdn.shopify.com/s/files/1/0465/2993/7566/files/reporting_spss_anova_results.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/josawogajuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/rocefin_injetvel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/fuwedidojigapuxivuro.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_off00006427.bin
a86592a038867f0a359eaa8ede80b18862e428ce29705f4f676d1351ca53dba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 5332 bytes
font_01_sfnt_off0000763e.bin
a51d449d484ef4e18afebc8b1fea731b2340626fea4a6e8981194cdca0ccd7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 9644 bytes