Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc343dabc9112c3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 10:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ab6dd8177baa31f032644dffe8c626 SHA-1: 7e3dabe83d6b5f950e47a3652a9443df389b33f2 SHA-256: 6fc343dabc9112c3efbaa74c59fe5d01fe84ba2cdc758908b86b13ef1b3abfca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to 'converting fractions to percentages'. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt.

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.ru/wix?keyword=converting+fractions+to+percentages
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1849a1_7621a3ea7ab2487f846c15c068372d4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bedf3ff08ab343cea19c83c960407353.pdf
    • https://static.usrfiles.com/ugd/5e81b9_4b58039821b44f7dad22b8fcd9728385.pdf
    • https://static.usrfiles.com/ugd/50de67_d7c82c07e69c44b39391019b6fe4fa9c.pdf
    • https://static.usrfiles.com/ugd/4479ed_964f901242174c089b03882b6667ebe8.pdf
    • https://static.usrfiles.com/ugd/dd4472_24d5d8a3cffe437399a37b38a31bd33e.pdf
    • https://static.usrfiles.com/ugd/ab922d_bf576d0cde5345c181e50dc22ac6a669.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e04bd0537104fb78929789da62f4ee1.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_7abc70a2bf2548fc818e5cd6762a849a.pdf
    • https://static.usrfiles.com/ugd/b85eb0_3cfd0e9cb48548379ad7312bbacc778b.pdf
    • https://static.usrfiles.com/ugd/bfbc46_afc3bd38334b4471944ce23e0b1d09de.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_c9ec4ab984634b52bc3ec78aa1466744.pdf
    • https://static.usrfiles.com/ugd/078c79_b774bf4eecf947d1b85096e9ad54c6c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b06a01a1039a4ca4b79ed6da1d092866.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a76.bin
ee2d9977bf8fe40aed655b2ef4ca141fc3308f7716a6f23352e9776690247f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A76 5024 bytes
font_01_sfnt_off00006ba3.bin
205d14eab31f18664e08bfd2ed3ee87bc9c766868678585fce0d8ef3c535e489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 10568 bytes
font_02_sfnt_off00008f83.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F83 4324 bytes

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