Malicious PDF — malware analysis report

Static analysis result for SHA-256 383ec119e29f0e40…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 15:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b62e1686fd0b97cf7e258beab0bd29 SHA-1: b5609541134f9e998d266dc42e4f9397a1fc39bc SHA-256: 383ec119e29f0e40d4e449843aa79261ba3c010a841cfaaf374182beb40aa976
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=video+to+audio+converter+for+android'. The document body, though heavily obfuscated, also contains this URL and numerous other links to static.usrfiles.com, suggesting a link farm or redirection strategy. The primary intent appears to be directing users to malicious infrastructure under the guise of providing a useful tool.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=video+to+audio+converter+for+android
    • https://static.usrfiles.com/ugd/efb3f0_343d2d84b9bc472195cbd9ac7d961a7d.pdf
    • https://static.usrfiles.com/ugd/405339_7c2def5bf49b4069861744c88e848f3e.pdf
    • https://static.usrfiles.com/ugd/963627_3084d22e5d4c403cab4ba4b3cc87361b.pdf
    • https://static.usrfiles.com/ugd/4bb894_a2252a0b08484a0c87bbda99a4e1e593.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf7e75be42e84fb39461b4b2bf6d0847.pdf
    • https://static.usrfiles.com/ugd/fb5067_24a8118810f04c439fc18f442373830a.pdf
    • https://static.usrfiles.com/ugd/01bc73_b06e4f73872146f6abffeeb7fb6f1264.pdf
    • https://static.usrfiles.com/ugd/9cc572_8dd76fdd5b5342709fa1993bb77742f5.pdf
    • https://static.usrfiles.com/ugd/8cbfce_360cfc697f3d4efdb3ca360b795e7890.pdf
    • https://static.usrfiles.com/ugd/9e53d4_f0e2438738e147a1b117a7c8c0744efe.pdf
    • https://static.usrfiles.com/ugd/97aff7_baf11445552d468d8af4407b386ef515.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_off00006104.bin
de31f015e013aa7d608bd746cec21323a739c488eb16734478bbbb80d17cdec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 4832 bytes
font_01_sfnt_off0000718e.bin
020725cc39a6c0d92b8789eef764bcea4df8b990aecbd657ca5f437ef1294430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718E 10448 bytes

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