Malicious PDF — malware analysis report

Static analysis result for SHA-256 810944186eea57fb…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 03:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95a90f6b80907f90c14336f51582020 SHA-1: 957fe19b3f6cd0940a7b3278a3b8f0d2a9961d95 SHA-256: 810944186eea57fbc3e4e30f41590cecf05cceb4512556c0199b0b7ac5766e82
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm used for SEO poisoning or to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=ejercicios+de+sinonimos+y+antonimos+para+secundaria+online
    • https://static.usrfiles.com/ugd/d162e3_d101399fde584cddb5254f6bbb552c72.pdf
    • https://static.usrfiles.com/ugd/72b0e7_82c98467f330463ca108a6c28ddf2337.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbb3787194134a7f995df11206e13a80.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/86547112611.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/43968106939.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/82840858467.pdf
    • https://cdn.shopify.com/s/files/1/0463/5118/8130/files/96760079435.pdf
    • https://cdn.shopify.com/s/files/1/0439/0102/6472/files/3624529094.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/32959643008.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_off00006063.bin
bdb877487cc3d1b838fde63fa2aa8f46a6bb9b59af2868f3d820d39f780233be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 5356 bytes
font_01_sfnt_off0000728a.bin
1676483138dfaaef6f57b40a66342f2e997aa26621a71be0e97ee70adc7d3d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 10940 bytes

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