Malicious PDF — malware analysis report

Static analysis result for SHA-256 f385d7c5c18e729e…

MALICIOUS

PDF

40.8 KB Created: 2020-09-09 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75dcb451ea264e22af15f665a4a4237 SHA-1: 7c66a2f6b2e6368b3a23ebcddd9f9fea685b0b5d SHA-256: f385d7c5c18e729e71cb3c1ac138536cb2f252f06f39a05dff7b0d6f251b9415
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, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files. The primary malicious URL is https://ttraff.link/wix?keyword=find+my+device+through+android+device+manager, which is designed to lure users into clicking it under the pretext of finding their device. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=find+my+device+through+android+device+manager
    • http://bupekika.crystalfletcher.com/uploads/1/3/0/8/130873843/9535984.pdf
    • http://files.azrielbermant.com/uploads/1/3/1/3/131383269/tuvexerunafi-soxafodepemomu.pdf
    • http://files.sylvanbeachfestival.com/uploads/1/3/1/1/131163559/3706158.pdf
    • http://files.yoyojake.com/uploads/1/3/0/9/130969624/vedifixejilan-xoketodeliwimax.pdf
    • http://malok.travelwithsouthwind.com/uploads/1/3/0/7/130739046/xoximuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/66260496038.pdf
    • https://cdn.shopify.com/s/files/1/0429/5658/7174/files/convert_aac_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2442/files/ballade_no_4.pdf
    • https://static.usrfiles.com/ugd/5be868_a4e9482be0a74ed78fbc9728e8df5265.pdf
    • https://static.usrfiles.com/ugd/479fa9_07ca6ac3a7324cfa9fe42e6898c152c5.pdf
    • https://static.usrfiles.com/ugd/d2751c_cf47b01a1b6b4e7db7597bc6d0b1de6a.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/kemageta.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/shakespeare_sonnet_130.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_off00006236.bin
b135a3b18f2214ec29227b9a00b006d2f5dbbbd929c68dc4dda096a1c8d30df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 5260 bytes
font_01_sfnt_off000073fd.bin
3d13ea05d5b9aa10c7ba7aa024927f5660b62b0ecbd964314eec042761616815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FD 9968 bytes

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