Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8a67f2db1be4ff…

MALICIOUS

PDF

44.8 KB Created: 2020-09-09 00:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b566cd270d510c64f2672dd040769cb2 SHA-1: d797946626698fc6ada300948a5d07fb18b42ef6 SHA-256: ad8a67f2db1be4ffd208fd384e565cbf77d4bf7f4cce589504e92c41377e6ba4
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as an advertisement for a Bluetooth keyboard. This link, https://ttraff.club/wix?keyword=bluetooth+keyboard+android+tablet, is the primary indicator of malicious intent. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, suggesting a broader distribution or SEO poisoning tactic. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=bluetooth+keyboard+android+tablet
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/92739512048.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/wuxonowugugibuvateximowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/rixebunibefezifedix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/lajep.pdf
    • https://cdn.shopify.com/s/files/1/0446/5026/6787/files/bill_of_sale_fillable.pdf
    • https://static.usrfiles.com/ugd/027f51_edf07e4dcedc47cea26c3969a80987a0.pdf
    • https://static.usrfiles.com/ugd/70c1f8_8869c6025f57468e8f5788ef7bc0c514.pdf
    • https://static.usrfiles.com/ugd/22bf55_9cef3f7c4acc4ab18a19af2fc8470806.pdf
    • https://static.usrfiles.com/ugd/37428b_53f0b8c3b5e74f1ba132846890ca2f40.pdf
    • https://static.usrfiles.com/ugd/b85eb0_3cfd0e9cb48548379ad7312bbacc778b.pdf
    • https://static.usrfiles.com/ugd/f3bfbb_01837090ef3f4eac96de77a92b67d943.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/sonijijeredetap.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/47944657837.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_off00007174.bin
95da3e1ca412c84d6339fa9537331b40c87f70cc29e572465abf8cac507d6401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7174 5092 bytes
font_01_sfnt_off000082c2.bin
12e39de78aec4dfe0bf55d26ae8764b7dc77ede9e7f09387e760e65dd099ae02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C2 10316 bytes

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