Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c8c078215dc258…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 00:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3d0f7af9705d30f937d4596651ac22 SHA-1: 00423dfb8b998f27339acd0766a84b824100440e SHA-256: 19c8c078215dc25860718d2cb0a16578a6f408b630d752a3f93e65343c66ed6f
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru. The document body, though heavily obfuscated, contains references to the game 'Assassin's Creed Renaissance' and the PDF creation tool wkhtmltopdf, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector confirms the delivery mechanism.

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=assassin%2527s+creed+renaissance+pdf
    • https://static.usrfiles.com/ugd/77941b_0f26fc6e529a444b820c6ab497ee236d.pdf
    • https://static.usrfiles.com/ugd/80c1db_d5e2b6f3a30640829a3a9531f7512819.pdf
    • https://static.usrfiles.com/ugd/ddb60a_31b75e67ade14ab8b90a39632a931075.pdf
    • https://static.usrfiles.com/ugd/fef806_3a056f114dc24c19aac59212f32f2780.pdf
    • https://static.usrfiles.com/ugd/b8c837_16a197206b3d42e798e881b61fe74dd9.pdf
    • https://static.usrfiles.com/ugd/76de1a_d75d6fd3c61c49a9addd92e1bbb0357c.pdf
    • https://static.usrfiles.com/ugd/3f80ec_59dd4ec12f6948fcb79f78c644405b2c.pdf
    • https://static.usrfiles.com/ugd/80c1db_eeda87649db84521917fc3c527946a13.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e31703808bf4874b7dd69aadd26b9a4.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_39019aee38e74aafbdb191cc5ed8b9ec.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_off00006603.bin
1f6a9f3145be75bd0bf4ba75ca69e77efd63960c3db8bbcb73c0326ad0ef2aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 5140 bytes
font_01_sfnt_off0000778a.bin
cee751612203c662f0445f5d6832f8dd189f2603b26c35e643f88e44d179478c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 10120 bytes

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