Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fae9f369e0a1a0…

MALICIOUS

PDF

47.0 KB Created: 2020-08-31 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c43037d373954284800df134486749cb SHA-1: 87467f57392dd1b7e6a49b0e2ced926669699373 SHA-256: 35fae9f369e0a1a058582148d883265baa3f176943fd53da6e3cb2068ed36b2c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, contains the URL `https://ttraff.com/wix?keyword=maria+helena+diniz+curso+de+direito+civil+brasileiro`, suggesting a lure to a malicious site disguised as a document. 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.com/wix?keyword=maria+helena+diniz+curso+de+direito+civil+brasileiro
    • https://cdn.shopify.com/s/files/1/0435/8569/9997/files/liwadatumojuxoluwaxexaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/97737045228.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/tinkers_construct_best_tools.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/2475234380.pdf
    • https://cdn.shopify.com/s/files/1/0438/3129/6160/files/percents_decimals_and_fractions_worksheets.pdf
    • https://static.usrfiles.com/ugd/0e2875_1593c5d029c6441193460873c6fbdb90.pdf
    • https://static.usrfiles.com/ugd/33a16d_76a434deae6544648e0682e7b1d40b40.pdf
    • https://static.usrfiles.com/ugd/6cf392_cff7b44737dd4b28b15c0e221fd58d1a.pdf
    • https://static.usrfiles.com/ugd/cc03df_f1873b31afc24915b830741c89ca891a.pdf
    • https://static.usrfiles.com/ugd/10a4aa_862caabae15e4d2bb8d6964ac5ce1a0d.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/81600172330.pdf
    • https://cdn.shopify.com/s/files/1/0440/2534/8261/files/10161902686.pdf
    • https://cdn.shopify.com/s/files/1/0438/7966/1736/files/83940566716.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/all_japanese_adjectives_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5324/files/8085_microprocessor_addressing_modes.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_off00006756.bin
749ce9f782110004dac97096cd7bc0e324eb8216a3a927effcf706c02ad72c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6756 5284 bytes
font_01_sfnt_off0000794f.bin
f62073393032b2b46ee0fbfbb394c6d794eed8b5a937335858b0652a53c9018d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794F 18832 bytes

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