Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a22643e9c5f8ab…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 08:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e385398b5604464a24031d33ff04d9 SHA-1: fc6b741d3e71a200028ff89ddcb88bb3f3cf4e71 SHA-256: 83a22643e9c5f8ab7a3d03b35ede472a97a4492f3583dc67ebae91aad710ab0a
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary malicious URL identified is https://ttraff.ru/wix?keyword=marshall+mid+anc, which is likely used to lure the user to a malicious site. The document body is heavily obfuscated but contains references to the malicious URL and other PDF links.

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.ru/wix?keyword=marshall+mid+anc
    • https://static.usrfiles.com/ugd/b8c837_a64beb263fe24892973674583cd30c27.pdf
    • https://static.usrfiles.com/ugd/5360f8_e2c7966b12de444ca88c91ab6d05f5f7.pdf
    • https://static.usrfiles.com/ugd/2ac701_a423ebfd04c4463b8382b04277614337.pdf
    • https://static.usrfiles.com/ugd/a467d2_6fef3e8d5240493d94f6b88aa3b1a90d.pdf
    • https://static.usrfiles.com/ugd/271e65_41cd5815a86b4ace9a0f804d87e0c508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/rogue_swashbuckler_5e.pdf
    • https://cdn.shopify.com/s/files/1/0457/3167/6326/files/renozutilerokugukapuvuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/gevefuwilekajukuluso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/film_anime_romance_sub_indo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/50301508457.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/backup_whatsapp_messages_to_pc_android.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_off000064a6.bin
790bbd28bfda19e56ecb239b21b4b983cd4f35102e7851d8553b429876bf90be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 4664 bytes
font_01_sfnt_off00007430.bin
604ce14b863d37666fb79ddcc7d2d2a8a39b5f9ce978acd2ea52bab24e8c5c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 10212 bytes
font_02_sfnt_off00009734.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9734 4324 bytes

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