Malicious PDF — malware analysis report

Static analysis result for SHA-256 524c62e0be5bb6a2…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 23:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67baa250bd3095f5ce8db0f5b44de04f SHA-1: d6caa8819257bb5ebca1307972a7f3050ed53740 SHA-256: 524c62e0be5bb6a209f302f02ca8a613115b73d8140279c6b37987d13f2538ec
140 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with many links pointing to Shopify and static.usrfiles.com domains, likely for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains a reference to 'All cast receiver pc' and the malicious URL. The heuristic 'SE_CLOUD_DOC_LURE' indicates the document impersonates a cloud file-sharing service to trick the user into clicking the malicious link.

Heuristics 4

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.cc/pify?keyword=all+cast+receiver+pc
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/60430450552.pdf
    • https://cdn.shopify.com/s/files/1/0433/7441/1926/files/subordinated_loan_in_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/24391788252.pdf
    • https://cdn.shopify.com/s/files/1/0464/8825/6680/files/power_amplifier_class_h.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/vetuvawibitu.pdf
    • https://static.usrfiles.com/ugd/906e9f_01290d811a144a8abb90885944f7e084.pdf
    • https://static.usrfiles.com/ugd/99afdc_3fcd4aef546547e5878479bcfdc02cec.pdf
    • https://static.usrfiles.com/ugd/23e9be_404a651b2b8c405cbbf48668798451d3.pdf
    • https://static.usrfiles.com/ugd/dba42a_925cb0baf8ab40d489f0cc29128e1d74.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_69a14429f6284c0fb0b472a8aefbf1da.pdf
    • https://static.usrfiles.com/ugd/b8c837_c808b6b09c1e45648afa93b61cb4a8ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_88f9f808c7174413afa36194e9306ed1.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_540cc7a03cdf47aca729a8954979b500.pdf
    • https://static.usrfiles.com/ugd/a64c8c_e6af81950b57481eafd562cc2b92ff43.pdf
    • https://static.usrfiles.com/ugd/856cea_f4b85389be364655ac16734bb9631853.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_off00005de5.bin
a5c1e8be163518404e5ba3bbd72784421e114dc4da0d9390b4af8b041736f5ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE5 4548 bytes
font_01_sfnt_off00006d61.bin
75c318e02c18b226a79405f8cb0ba23f29ddaab5b8ef4c1e7d770940449d987a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 10060 bytes
font_02_sfnt_off00008fe4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE4 4324 bytes