Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e8fabcce4a8e26…

MALICIOUS

PDF

63.7 KB Created: 2020-09-07 03:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449adf5dad24a3e32f14393372bc6237 SHA-1: 8a65e1904fc328041c1b09921fc29e9f8c4d7d4d SHA-256: 79e8fabcce4a8e26496f6f77c158067a963607b68ded435e3d05e3b91ad65ef5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the target URL and other PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sheets+api+nodejs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0aab01_4b36a3bf4e1a42b58c63c820a1ff1f76.pdf
    • https://static.usrfiles.com/ugd/90d19e_4e4d867a7abe45b79d9545516380d6c7.pdf
    • https://static.usrfiles.com/ugd/9ea91e_4672233f6fe942b2ac1b69edd7054e04.pdf
    • https://static.usrfiles.com/ugd/e02969_b8e24af3b5c64850a2c82752131012ca.pdf
    • https://cdn.shopify.com/s/files/1/0430/7723/8945/files/goversoft_llc_privazer.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/bihar_si_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/87939079574.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/56676215088.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/pidenodago.pdf
    • https://static.usrfiles.com/ugd/b444d4_1f9b121fbe44494e86105c17e4fd6cc7.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_338890b6ba494cc790a6817d0abdff5b.pdf
    • https://static.usrfiles.com/ugd/a13bc2_d691f424b42144e3b56799c6c55eed0a.pdf
    • https://static.usrfiles.com/ugd/edb4a7_3bc8ef3d43c54126a85eb0fa4576b945.pdf
    • https://static.usrfiles.com/ugd/8d0191_da770f04f3134c838a24a0a5dedbb748.pdf
    • https://static.usrfiles.com/ugd/33ab24_c3621a8b33a245f3994c756ff528dd56.pdf
    • https://static.usrfiles.com/ugd/55f640_84c1116bdb0d424dabb7e97720e67e70.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009701.bin
526d7fb67a9dcae374e9c7d8810d1b1132aa7ead73e81e3a5d949f2e2a3ab8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9701 5100 bytes
font_01_sfnt_off0000a85a.bin
528486ae581dc33f82abe9cd0a6cc90470eb5443272ce029cc2edf6b0d2da83f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA85A 16564 bytes
font_02_sfnt_off0000dc1c.bin
d8534af3288fbc0fae4253044644bfd673beb81032b6ae7df669b7e4eaf9bff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16392 bytes

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