Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8956571257b802…

MALICIOUS

PDF

54.0 KB Created: 2020-09-02 16:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e9880ea8b7c33cd5c0cfb18a4263c4 SHA-1: b6435287e621aa9c3441d665da8a58ee7a0af69c SHA-256: 4e8956571257b80255de457ef4cf4985372fadaf38f72f4a78f8871d4d46fd1b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to improve search engine rankings. One of these links, 'https://ttraff.ru/wix?keyword=angle+of+depression+and+elevation+worksheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to a malicious site. The ML classifier also flagged this PDF with high confidence.

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=angle+of+depression+and+elevation+worksheet+pdf
    • https://cdn.shopify.com/s/files/1/0437/4682/0245/files/jasper_report_visual_studio_2017.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/android_butterknife_button_onclick.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/68847015929.pdf
    • https://static.usrfiles.com/ugd/978dd5_4192ab5656114097afe61587dcacbba3.pdf
    • https://static.usrfiles.com/ugd/2c8d66_1e1f9bc82cc74b32888c4b8521101f33.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/kudutakiwakonategegin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8167/files/86683865051.pdf
    • https://cdn.shopify.com/s/files/1/0465/0359/2104/files/guided_by_voices_bee_thousand_zip.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/mesigefogabip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5880/files/bombay_blood_group_information_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5178/6135/files/vascular_dementia_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3452/6375/files/trust_deed_format.pdf
    • https://cdn.shopify.com/s/files/1/0440/7702/3384/files/commas_in_dates_worksheets_for_second_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/faguse.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/vaastu_shastra.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bba.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBA 2828 bytes
font_01_sfnt_off000085b5.bin
22aa83c9e0c97640ee0ddcaf42a5c3cf3d11d3bfdeda62ee311cdc41b837761e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B5 5296 bytes
font_02_sfnt_off000097c9.bin
030d47712f9d13815d0fcc84718ec8ffab53f92ff1c46a6537c69e95dcfef180
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C9 10000 bytes
font_03_sfnt_off0000ba07.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 4324 bytes