Malicious PDF — malware analysis report

Static analysis result for SHA-256 97424429cd59ce61…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 00:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf3253733d7fc144f73300782f7c452 SHA-1: 2ef3109e1b9d79048bbb4db5c95b7956a181db7e SHA-256: 97424429cd59ce61eee574b5b2941f76f52f9eb1eed36f6e93ae502565d3495e
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.ru/wix?keyword=android+studio+test+coverage+report'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'Android studio test coverage report', suggesting a lure. The PDF also contains a link farm, with many links pointing to static.usrfiles.com, which is flagged as a potential indicator of malicious activity.

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=android+studio+test+coverage+report
    • https://static.usrfiles.com/ugd/685707_09a1a22a9d1b41eabe1d41c7a604ae4d.pdf
    • https://static.usrfiles.com/ugd/bd5c68_c5b51251fff54d64897bdd5c2349f918.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd2ae9ae8ce14bfdb84d20c21b217453.pdf
    • https://static.usrfiles.com/ugd/91e123_b5b4bb24a1df413d85a18946670b0187.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_5831f6382fc74b3b92e8b0fe2b45a3c2.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/after_the_love_has_gone_lead_sheet.pdf
    • https://static.usrfiles.com/ugd/97368a_c8b92cfc39c54835ac3275ce014c717f.pdf
    • https://static.usrfiles.com/ugd/f09a9d_3ea361daadaf4ef48396d7c396e50cb3.pdf
    • https://static.usrfiles.com/ugd/3bcfef_b9aae7713c034f2ab12273805951f7e5.pdf
    • https://static.usrfiles.com/ugd/e4ff69_d8337982af4d4fd8837a24f0d7a51176.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/surah_rahman_alkalam._pk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/direpa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/46765521565.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/44725475366.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/15924714326.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_off000078d0.bin
cd4286d43f9d70a47b8155aa4ec35bda447a1b245db8615793e2481ccc17c06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 5260 bytes
font_01_sfnt_off00008acd.bin
67554bbfff3c12de3de64581de1d450b08ea9c0d95b91cdd023c9bf5b756a9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACD 10212 bytes

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