Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab4dcb75b1dbec…

MALICIOUS

PDF

38.1 KB Created: 2020-08-31 23:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f94fe0ac47651f19ff042041d9113b SHA-1: 829716bb139bdfbfc6c0bcb92faa905207fd7406 SHA-256: b7ab4dcb75b1dbec77684de4c60cf1c053906b8f5e5e13e86018666e2cc887d4
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=chal+chaiya+chaiya+instrumental+ringtone'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The document body, though partially corrupted, contains references to the redirector URL and other PDF links, suggesting a lure to external malicious content. No scripts were extracted from this sample.

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=chal+chaiya+chaiya+instrumental+ringtone
    • https://static.usrfiles.com/ugd/b8c837_c69011b469df45fc8f67f5be9037acaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7dd1623cdc14e0389253627334ffbe6.pdf
    • https://static.usrfiles.com/ugd/b8c837_99708c189bd14f61846832929278c864.pdf
    • https://static.usrfiles.com/ugd/b8c837_6955e9d84cd848d2a21972a51ac05b6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d867d7014664b87bf22cb521000f3ed.pdf
    • https://static.usrfiles.com/ugd/20d83a_108220203b144f7baad33188d9bea6c4.pdf
    • https://static.usrfiles.com/ugd/738632_eef52272584048db9af38967b1cbe0ea.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_1fc8c53a3f3b493a88bfe855dbdcd12e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/98435604437.pdf
    • https://cdn.shopify.com/s/files/1/0436/1152/1187/files/24378268292.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/85275887230.pdf
    • https://static.usrfiles.com/ugd/ef253e_bb9089c4683a4fd5967bcce10007343f.pdf
    • https://static.usrfiles.com/ugd/a91264_16e64926aba1472da88e1ef37abd1587.pdf
    • https://static.usrfiles.com/ugd/5a1791_bb76149b7ec342428dd9131a514b96c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_591654e411f94a9eab90d94087a75b17.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_off000051e5.bin
265cd06ccddea1620f08c88e98688e842271847df7d77452c59432f7f5e76a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E5 5220 bytes
font_01_sfnt_off00006383.bin
b7ff8ca2171d7b0131c2e68ffc4b541f7dbd028caf451ab5c35efee47517b8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 12640 bytes

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