Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3a1165d338f6ec…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 13:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e50bb00e29641830cd5df526382020d SHA-1: 70b264c12e5274131008c762929795c3b6193158 SHA-256: 8a3a1165d338f6ec15d23809497d90dbb6de4c1df4100bd8c9cc8f6975e74405
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the embedded URLs, 'https://ttraff.com/wix?keyword=alimentacion+del+cocodrilo', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting a lure to external content. The presence of numerous links to PDFs hosted on 'static.usrfiles.com' further supports the link farm characteristic.

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.com/wix?keyword=alimentacion+del+cocodrilo
    • https://static.usrfiles.com/ugd/b8c837_a81b69b956e5473c91c32c5a7c31e113.pdf
    • https://static.usrfiles.com/ugd/0c268c_62ef5e41713e4616bdcedadcf4496fc2.pdf
    • https://static.usrfiles.com/ugd/9ea91e_e7c51a5a46754ec3a081a08eb25a13a2.pdf
    • https://static.usrfiles.com/ugd/8dde66_93ad5a2fb59a48bbb1c922da6408f686.pdf
    • https://static.usrfiles.com/ugd/b8c837_f01de4e080714364a9ac9bfc411a4b7e.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_c71c66f42005409aa31b77d4099a4101.pdf
    • https://static.usrfiles.com/ugd/a771bd_00db7248533648d5b18faf6b3db91a33.pdf
    • https://static.usrfiles.com/ugd/60933b_ddec8f2cf0ee434f9ff6c15d0f0d475b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9109b88c05074a64ba9531a98d372619.pdf
    • https://static.usrfiles.com/ugd/cf79db_d41d17e7e7914ccab22707d174aca2c9.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/jemujod.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/makalah_atraumatic_care.pdf
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/75625197408.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/muxowokufudezutojuzel.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/2921456364.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/25601494450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006196.bin
2d5ac253a33d203576c95c3e401a3da630d27c06e0d7f2c01fb883514ff22459
pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 4684 bytes
font_01_sfnt_off0000714d.bin
ab1b0cad67e0e3dfd614059f1093d96e1ecbb589909b547ece02f5016a1d4d33
pdf-font-stream PDF embedded font (sfnt) at offset 0x714D 11016 bytes
font_02_sfnt_off000094e2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E2 4324 bytes