Malicious PDF — malware analysis report

Static analysis result for SHA-256 77da8e99fab821d4…

MALICIOUS

PDF

47.1 KB Created: 2020-09-18 11:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0223036aacf39091cb6bcc2a5a34816c SHA-1: 1612467ee8f69058afda7af8cb35d6b20165406a SHA-256: 77da8e99fab821d4b85879052a0a514bdb4701e22bdadfb2493b3d9064497c4f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=constitutional+law+2+exam+answers'. The document body, though heavily obfuscated, contains this URL, suggesting it's intended as a lure. The PDF also features a large number of external links, indicative of a link farm, further supporting the malicious redirector finding. The ML classifier strongly flags this PDF as malicious.

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=constitutional+law+2+exam+answers
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/30722266395.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/unesco_history_of_civilizations_of_central_asia.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/michelle_lewin_diet.pdf
    • https://125e6392-2837-4a55-be48-a51a257ec399.filesusr.com/ugd/d43733_d4c83abb6cb845468bbaa6646a956798.pdf?index=true
    • https://7c46d593-e132-42b6-9fa2-acfe7ee078d5.filesusr.com/ugd/784815_9c5f5c9e2c8b4212a885fc8eacd8086b.pdf?index=true
    • https://db4602ea-b204-46bd-a345-1db490bdb5a2.filesusr.com/ugd/80fd5d_09b36499df5f40cdbff1169cabb439b2.pdf?index=true
    • https://944a6463-79dc-4c8d-a4f7-096e0612111d.filesusr.com/ugd/9edd50_1c6acb987ac74b47a9984870615ba500.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/components_of_working_capital_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/6471/2599/files/free_download_adobe_reader_10_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/95448016002.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/53841703422.pdf
    • https://f457472c-153e-479e-801e-e8b558f45222.filesusr.com/ugd/440e29_7f67a8eb58fc4ee295e492925b91430e.pdf?index=true
    • https://941b3552-54d3-42b2-9a8c-3b8281fbff0e.filesusr.com/ugd/ffe0d3_f0f01552aabf42eaa9ae4a636c20502d.pdf?index=true
    • https://047cfde6-b422-4d99-aaee-7043c9995588.filesusr.com/ugd/97aff7_141f28cb65be414585f9d494457132da.pdf?index=true
    • https://158242c9-902e-44c1-af04-4e7d39727589.filesusr.com/ugd/834936_99cedd9f03134181afc0d6a62d1ff56b.pdf?index=true
    • 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/
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/components_of_working

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079d3.bin
1f3e0d73087379984342968af40a00b9801a8f13688753d98f110e3dac46b967
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D3 5028 bytes
font_01_sfnt_off00008ae4.bin
758420a9ad2e43999f28b82e405ba9fbe61ef65050309bac191652a11e515560
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE4 10548 bytes