Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b2b30728ce0359…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 054bb04f956a952c9245a1a7093b396c SHA-1: 59e97315929644acbdc35dfcfffd04c70e6971e2 SHA-256: 53b2b30728ce03597ae91cb7eb99829e7ff0f35d3ebe126fa6244044229e19dc
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/wix?keyword=s%2525C3%2525A3o+cipriano+capa+preta+pdf. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=s%2525C3%2525A3o+cipriano+capa+preta+pdf
    • https://static.usrfiles.com/ugd/493135_968cae7adfda4a548fbbe557d9adb86c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c074f97ce5614b67994cb249c05d89f5.pdf
    • https://static.usrfiles.com/ugd/529dbf_651a42acd92940b1b28aedae97f7f969.pdf
    • https://static.usrfiles.com/ugd/a107db_df262c5c852a43a7819935c6531d727d.pdf
    • https://static.usrfiles.com/ugd/b8c837_207b4d899bf84769bf205cc39dfc9b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_47f7a01402fc48dbabd94c8980a3608e.pdf
    • https://static.usrfiles.com/ugd/cafc24_f6601340415147efb7b29f3632203a38.pdf
    • https://static.usrfiles.com/ugd/04e6f9_56dfdd9a1c6b4b13a58550798f8aa9d8.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/bapatapowikewokija.pdf
    • https://cdn.shopify.com/s/files/1/0452/1289/3344/files/ascii_format_for_network_interchange_standard.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/canadian_visa_application_form_5257.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/guzaxolisisezupusodipos.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/tekibatumiferululejefer.pdf
    • https://static.usrfiles.com/ugd/4826f5_c7852f0ad82748ec852347333dd1043e.pdf
    • https://static.usrfiles.com/ugd/362633_1de147ed48804e09b4a99f402443c3b4.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_off00006e83.bin
b8466724f9d38c3e3bca0b6b8446979f71cbff8630bd719ed898fdb6728f3bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 5360 bytes
font_01_sfnt_off00008028.bin
9ff6316acc6aabb70bf4c2f59c088ccc7cbdcd5d069b506aca0d2c1f0ec1d6dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 10956 bytes

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