Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5abd88f6666d69c…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02391058016fb1d65e9495f2afc06001 SHA-1: c1fffd0de0bbda8f04a7f544abac135853f32f47 SHA-256: c5abd88f6666d69c2c2f4700f54dd846cd245b7b94f2ab8bc620abd5567fb5a4
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, specifically for a popular movie title, to entice clicks. The primary malicious URL, https://ttraff.ru/wix?keyword=bajrangi+bhaijaan+hd+with+english+subtitles, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the lure. 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.ru/wix?keyword=bajrangi+bhaijaan+hd+with+english+subtitles
    • https://static.usrfiles.com/ugd/b58d21_5874f20b69be4dfaba0116034ca93506.pdf
    • https://static.usrfiles.com/ugd/3b47cb_769cf4fde7254bdb8d05c79a7e35553b.pdf
    • https://static.usrfiles.com/ugd/daca0d_253ef312fb6e48799710f9d06b948628.pdf
    • https://static.usrfiles.com/ugd/63022f_3214cee8754745c8bed8dec21a76f4f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_912440e77ed84e83bf6efcd6eb7d9f54.pdf
    • https://static.usrfiles.com/ugd/e1c37d_fe7c69fd7aa14a259306b9ac86b32fc1.pdf
    • https://cdn.shopify.com/s/files/1/0437/6818/4993/files/jogogotijubafawovubug.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/26337767284.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/wufabosuxodevilusageriris.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/28166915955.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/dozewonolonodipovuzu.pdf
    • https://static.usrfiles.com/ugd/9e41f0_b086283263a84eadaf86e4333119ad7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1047222140094212abc2e0fb59586faf.pdf
    • https://static.usrfiles.com/ugd/3f0e57_58e1478c5e5241c9aa4e0b501223743f.pdf
    • https://static.usrfiles.com/ugd/238140_459cf94d2d514322886a9a013c7dc270.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f4.bin
0fd34175ab3fce2462aadc23946a29e5ec132df2c3c86244185cd8f12a267b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 3468 bytes
font_01_sfnt_off00006d69.bin
0cd5ce9f00b8a82b48a86184b05b82bd01c662cf4c391c4f1303cb4279adbc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D69 5216 bytes
font_02_sfnt_off00007f22.bin
e534f019846b2619730620e355d774d35118f54e484f8b8fc7ea418175e301dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F22 10276 bytes
font_03_sfnt_off0000a250.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA250 4324 bytes

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