Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93fc8d98689a0de…

MALICIOUS

PDF

67.3 KB Created: 2020-08-30 07:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ceee4c4e95e185052e7e074e40b3d6e SHA-1: 9a465959f334f2f67a461832a21168c0c70f593a SHA-256: a93fc8d98689a0de8e4f3f8d44741f52b7387c8ebba8a0a88e129c3f033f65ac
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is presented as IELTS reading test practice material. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF links, likely to mask the malicious intent. The primary attack vector appears to be social engineering through deceptive content to trick users into clicking the malicious redirector link.

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=ielts+reading+test+practice+2019
    • https://cdn.shopify.com/s/files/1/0433/9689/0785/files/holes_anatomy_and_physiology_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/spss_data_analysis_for_univariate_bivariate_and_multivariate_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/90602532353.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/nofusuxaxigojinujew.pdf
    • https://static.usrfiles.com/ugd/9421c8_8b694188a678454e8830d11f68278147.pdf
    • https://static.usrfiles.com/ugd/5be868_c27f393a5ed643dc907222503780d1a6.pdf
    • https://static.usrfiles.com/ugd/1a89c8_34391fab4b2e46c4a5427e1009293282.pdf
    • https://static.usrfiles.com/ugd/599f1c_8df03f488bf94b779ab2e778d1534e3a.pdf
    • https://static.usrfiles.com/ugd/837d34_7bf92b4c98c24866aff9b6a405510c98.pdf
    • https://static.usrfiles.com/ugd/122077_0c23712590fa4c6cb2775f1c0c51861a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
    • https://static.usrfiles.com/ugd/865d50_4f78219c4762491d8878f7d3bd92f28c.pdf
    • https://static.usrfiles.com/ugd/374ce0_908eda643dc546f1a25756ef47057a52.pdf
    • https://cdn.shopify.com/s/files/1/0437/3728/4762/files/gurupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/duvof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/hdfc_life_opportunity_fund_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/lugemumonekutop.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
stream_006_off0000dc98.bin
3aec78c4149a3e52064f840d8a692adbe15497042d0f9e648c924465f7273e92		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC98 20984 bytes
font_00_sfnt_off00006cee.bin
91ec0e37581a6af0222e44c46611ad76736e1ffdb72ee2de47c7b82d0fc7527a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 17372 bytes
font_01_sfnt_off0000a4a6.bin
68ec8c637668107ea79375f7439735ac2fbfb5774e37ac06448597b3b75b28e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A6 5660 bytes
font_02_sfnt_off0000b7ef.bin
5dcbbcfd8cf093ba85f551c73d396b9d2fb6950e7e7971bd1379b307328aba10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 10692 bytes

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