Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33ea32847cd094d…

MALICIOUS

PDF

38.2 KB Created: 2020-08-31 13:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e5ea6f9a8851e8ceb567f2d56a8341 SHA-1: 6693ec678d3b03170b5a67ce9d53d26754bad4e2 SHA-256: c33ea32847cd094d04a57be77977f4b07d0bb3867717a52b893b9d270c873ac3
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to "Affiches cinema grand format" and the malicious URL, suggesting a lure. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=affiches+cinema+grand+format
    • https://static.usrfiles.com/ugd/fa6f14_58d01851e33e4d4a9706eb6dab777572.pdf
    • https://static.usrfiles.com/ugd/857e61_ea50eea1b6ac4896b8b760b8c0ba02cb.pdf
    • https://static.usrfiles.com/ugd/12f4eb_13074820aa3b4e2bbc9a5ad603cb2022.pdf
    • https://static.usrfiles.com/ugd/b8c837_b03471109f874eecbcb614e3141d72b7.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_91fac63f50304beb82b3512bc88e40a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ddf5f4dfa9344e29153c837d65911be.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_9d262776552b44a7b6ae9499a9498014.pdf
    • https://static.usrfiles.com/ugd/b910ae_3f190bf6198f481284118c277cfc5458.pdf
    • https://static.usrfiles.com/ugd/b8c837_811a76de6e2a46d895548fab17035b52.pdf
    • https://static.usrfiles.com/ugd/b4a829_1b5e2c9740e74e91880c5e7d3bd64960.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_off000057ed.bin
9f4e86808b3bbece7c9b68807dadc6ebb9209287471f63b95d5d1682e3377776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57ED 5392 bytes
font_01_sfnt_off00006a1c.bin
910174a48da1dcae545f0b4d6d9361143783dfd945621bb8d556022b51658e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1C 10128 bytes

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