PDF malware analysis — malicious · a81b88d3cda423ef

MALICIOUS

PDF

40.1 KB Created: 2020-09-09 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 03527ec21df9414d1d7c11e943a68ec8 SHA-1: d4d31c56e83f0bdaed144648418d35def348036e SHA-256: a81b88d3cda423ef1a42902df0b7ec61e93dcdf04d4563c70cc98e56ef606c80

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/wb?keyword=abc%20tracing%20worksheets%20printable. The document body, though heavily obfuscated, contains references to 'abc tracing worksheets printable' and the URL, suggesting a lure to download or view these resources which ultimately redirects to malicious infrastructure. 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.ru/wb?keyword=abc%20tracing%20worksheets%20printable
- http://files.flynnscareerandcollegeready.com/uploads/1/3/0/7/130774970/5b781fb64548.pdf
- http://files.skinnykittyfarms.com/uploads/1/3/2/6/132695663/tudozerinura-boterozab-topun.pdf
- http://moxolutuz.usa-smoking-supply.com/uploads/1/3/0/7/130739602/4467006.pdf
- http://files.sweetpeatakeaway.com/uploads/1/3/1/1/131164168/pedizuruwir.pdf
- https://static.usrfiles.com/ugd/21e6f2_06599d69cdd5411d914177f88f42194c.pdf
- https://static.usrfiles.com/ugd/1cc777_abe5c7d099d04e8e8932e65839841b87.pdf
- https://static.usrfiles.com/ugd/a6e5e9_79809fbac4354aa89f8e5ffde1cff258.pdf
- https://static.usrfiles.com/ugd/cb4a18_2eaf1f4ccafe4983a53cbd0367eabcc9.pdf
- https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.pdf
- https://static.usrfiles.com/ugd/e5412a_f1f260b3fd6347898f1704a005d57543.pdf
- https://static.usrfiles.com/ugd/32777b_a31b4e9e29614beba2b7d3ca8e718249.pdf
- https://static.usrfiles.com/ugd/80c1db_ea43857dc0494ee29cf61a6d136efab1.pdf
- https://cdn.shopify.com/s/files/1/0431/1161/2572/files/singapore_crs_reporting_jurisdictions.pdf
- https://cdn.shopify.com/s/files/1/0428/3708/2271/files/submit_button_on_form_not_working.pdf
- https://cdn.shopify.com/s/files/1/0434/9231/1206/files/kojoxux.pdf
- https://cdn.shopify.com/s/files/1/0435/2881/4741/files/auto-_update_map_from_google_drive_spreadsheet.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005c82.bin` `28aea0df25b6b1f7e9cca2d7605d4fb593df884b20937e8740dd5dd5a25841e2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C82	5480 bytes
`font_01_sfnt_off00006f34.bin` `238f584f2b62fbd13f086405ad0ce431537ee4c3ed93a29745b95049a3c01d3c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F34	10128 bytes

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