Malicious PDF — malware analysis report

Static analysis result for SHA-256 51efabb085c6dc72…

MALICIOUS

PDF

44.1 KB Created: 2020-09-02 05:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a54c462eb63b8da77b783689ff009521 SHA-1: efb34d6682a4a7b25c0691b8e8ea81064931f825 SHA-256: 51efabb085c6dc724498b569bc8f2a3625e94a243d1753bc6c8cf286228426aa
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.com/pify?keyword=news+world+report+high+school+rankings'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the suspicious URL and appears to be a lure related to 'news world report high school rankings'.

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/pify?keyword=news+world+report+high+school+rankings
    • https://cdn.shopify.com/s/files/1/0462/6540/1495/files/76226428116.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/65363829412.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/32694815045.pdf
    • https://cdn.shopify.com/s/files/1/0431/0122/5114/files/20192310327.pdf
    • https://cdn.shopify.com/s/files/1/0433/1490/5256/files/cs_lewis_the_great_divorce_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/modofafuxuvafuzorepe.pdf
    • https://static.usrfiles.com/ugd/0a052f_f333f5cf9d7b426da598d54b102e14c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c4e3d1d74f947e1ae4d67666191a89f.pdf
    • https://static.usrfiles.com/ugd/d78803_a4da5634c403440ebc16030bae53c114.pdf
    • https://static.usrfiles.com/ugd/599f1c_e7f743b16f934f56bd476c1ecc4342b4.pdf
    • https://static.usrfiles.com/ugd/de02f3_e0b10f3cab394a75a41a363738c9b267.pdf
    • https://static.usrfiles.com/ugd/9e41f0_b509662634594573b1d62165e08d3617.pdf
    • https://static.usrfiles.com/ugd/a31856_88c4bd276b6d48df963358287f731ec0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006099.bin
519af0622344a3377f7f6382de970715f55334cbb2da9ccdb12ba192fc15bf44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 5248 bytes
font_01_sfnt_off0000727a.bin
98bc30785c08c64aae8f8ae3e7d4b6c24d43bcd272d8ab95c6f747688799e56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 10272 bytes
font_02_sfnt_off000095a0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A0 4324 bytes

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