Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57e8e71c297bc75…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 01:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480e80af5bc67b0824eecefd40a8d595 SHA-1: dcb79a2a947f00b8da8f99a09383b55e6640805a SHA-256: a57e8e71c297bc755b6258812caa2784035eb1854db84115e8cb36a229f0d716
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=strong+curves+free+ebook'. This URL is presented within the document body, disguised as a link to a free ebook. The file also contains a large number of external PDF links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site or download further malware.

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.cc/wix?keyword=strong+curves+free+ebook
    • https://cdn.shopify.com/s/files/1/0433/3538/5243/files/bsc_agriculture_colleges_in_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/altered_carbon_livro_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/5480/9759/files/the_vegan_stoner_cookbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/avoid_node_modules_in_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1329/files/amiga_roms_retropie.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d687be7b4f143f5b13b56f1f1b8b583.pdf
    • https://static.usrfiles.com/ugd/98857b_ca01c1678af04083a2f8c03fa4392b0b.pdf
    • https://static.usrfiles.com/ugd/0e2875_aef93ad91116493bb3ab518e86b2f9b8.pdf
    • https://static.usrfiles.com/ugd/b88e3d_330e89f9f8f64c52aaff42ff34a46c1a.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/formula_shortcut_keys_in_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/94612255591.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_off0000647c.bin
a500e1e4af2ae6128aaadf37d66e7afa9fe546216c6a29c9e5bf8bb4c49bd397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5176 bytes
font_01_sfnt_off00007634.bin
e1776b71ffb1e14f2e435b24d314b5b48b0b142a891556bdf193df7282ce9e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 9840 bytes

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