Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e61a4ac28c9365b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 11:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6d8aa825517c7678d9932d94b48ce7d SHA-1: c0e9c4fdf39fc236d5b6de49aa41bd2fcf6a42d7 SHA-256: 9e61a4ac28c9365b22e76cc2fbe93de9fce323d426da5ac398b2ec82b597d032
150 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 'https://ttraff.cc/wix?keyword=imagenes+de+antibioticos+animados+ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://static.usrfiles.com/ugd/b8c837_aef4a56c6d534256a526c5e6a576f322.pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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=imagenes+de+antibioticos+animados+ru
    • https://static.usrfiles.com/ugd/b8c837_aef4a56c6d534256a526c5e6a576f322.pdf
    • https://static.usrfiles.com/ugd/8127dd_40465132df6846c18a004c89da20bc54.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c18c599f1804bd293cf5e7b71338cb3.pdf
    • https://cdn.shopify.com/s/files/1/0447/9657/5904/files/durezuwawivajodudenabatod.pdf
    • https://static.usrfiles.com/ugd/b58d21_f0c1889c309e4ae39bace57ba2a166b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3462070560c4448b9b6904571638a6a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3231aef4ee41f991438e683adcb6bc.pdf
    • https://static.usrfiles.com/ugd/88a84f_ddb73e72c458466b8cb562d0feaf83ab.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/debusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/xujejezewirumigaxejoruto.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_off000052e2.bin
242a51b08539632360a5b34fce5f4e9635806ecf2c2facc8724a1c817aa951e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E2 5304 bytes
font_01_sfnt_off000064c5.bin
f5685f3ff785387f29fc993ccac832edc6d14f42d377d7ce46e016f66ed0ede3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 11388 bytes

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