Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45fba62cd4e5e2f…

MALICIOUS

PDF

32.9 KB Created: 2020-08-30 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f41f63d7a0e810ad70df581517d1a00 SHA-1: 11bec92a7dc0920bcea10e709039fdfdcf68c03f SHA-256: b45fba62cd4e5e2f061c4f6d783c77b8bf60dfe2295ac506165894147acf0661
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Can t sign into cravetv' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the link farm.

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=can+t+sign+into+cravetv
    • https://static.usrfiles.com/ugd/99965f_61b5b76687184b05af277246b72d7540.pdf
    • https://static.usrfiles.com/ugd/f0e51d_c21a604c69de4879a90a486e3abb5b26.pdf
    • https://static.usrfiles.com/ugd/d775a9_ccfcaf167bde4a8aa27a3dd76d08332a.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/50910172147.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/zowufuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/81222389922.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/nonfiction_book_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_611ab0e9ed0f4056b6505d083582c493.pdf
    • https://static.usrfiles.com/ugd/912de2_755d94d4735a4aab915cb857fba14904.pdf
    • https://static.usrfiles.com/ugd/b4a829_31b3aa3dc393438fa56839049d7e8dd0.pdf
    • https://static.usrfiles.com/ugd/c8a981_1122b0f08471454e86b522b438080e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_85d4b6f958204b24b3f2a9278f2e0a7a.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_off00004537.bin
d2f2ec4d61a0cbd7b7c88383544216d548332231d42181feffbadf52f835e6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4537 4900 bytes
font_01_sfnt_off000055f9.bin
acf10d36ab1ce125b161751d5859eeba6aebdd1a6465f22b6ff1cc8ffa156482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F9 9724 bytes

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