Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bcaf54fa1db406…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 07:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b74cda756236291666647441ff6732d5 SHA-1: 2bc8d753fec5cdd0a3a0f8340062f2ef9e3fab45 SHA-256: c1bcaf54fa1db4068c6dd9f65b592c48b635418c3795035130108a2bf77507dd
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=peti%25C3%25A7%25C3%25A3o+inicial+novo+cpc+pronta'. This indicates an attempt to lure the user to a malicious site. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, consistent with a link farm or phishing lure. The ML classifier also strongly flagged this PDF as malicious.

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=peti%25C3%25A7%25C3%25A3o+inicial+novo+cpc+pronta
    • https://static.usrfiles.com/ugd/b8c837_7164653375814b81ac3ed7067aff12c3.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_0ce6d5def7fb4e1d82e73918db4f8f38.pdf
    • https://static.usrfiles.com/ugd/784815_aa22bf8355da435f8113e829bcfbb3ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_701b8985ac11465f8bac312c70df71e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcc17a7272924eab8106535be1aeb6b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b598d61539d341b69596c25235f27f7c.pdf
    • https://static.usrfiles.com/ugd/9904c2_2d6a37ac941c4079ae910790b0ec7121.pdf
    • https://static.usrfiles.com/ugd/576447_401eaab38b3641a489a4818834df662e.pdf
    • https://static.usrfiles.com/ugd/61b8bf_02992bd154454af3bdedf787b92c72db.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/pipitemamunitisozanefulum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/95267912726.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/types_of_bracing_in_steel_structures.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.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_off00005f69.bin
87187b4f7ee68da7b28b5a462f2ac61c2f260b997de7afe8a26d9eff61c33246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F69 5312 bytes
font_01_sfnt_off000070b1.bin
e430282a48fa0fe9438e1e5147d3ff5e23071fda134f0d4841878db174d17668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 12776 bytes

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