Malicious PDF — malware analysis report

Static analysis result for SHA-256 c667b788f2b9c3f7…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 03:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba34cb886e83776169e520db1417f6c SHA-1: 91745cb54ccd5361124ba7979ac5d4a41f237615 SHA-256: c667b788f2b9c3f71b5b8b9f2373687634bd2643bb0fbd430e716c12f8bafd64
120 Risk Score

Malware Insights

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

The PDF file contains embedded links that are designed to appear as legitimate educational content, specifically 'arithmetic sequence practice workshe'. However, static analysis reveals that one of these links, 'https://ttraff.com/wix?keyword=arithmetic+sequence+practice+workshe', points to a known malicious redirector. The PDF also contains a large number of other links, many of which point to benign content, suggesting a link farm used to obscure the malicious redirector. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which can be leveraged for malicious purposes.

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.com/wix?keyword=arithmetic+sequence+practice+workshe
    • https://static.usrfiles.com/ugd/b8c837_1203834decad448b98ae5f210da8ec49.pdf
    • https://static.usrfiles.com/ugd/5ad03d_d5027d967c7a44fc90eadabf5a3aaf7e.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_3769ad2b3e5a4d1e81bf48cd4135b0f3.pdf
    • https://static.usrfiles.com/ugd/fa32a6_7188a20334f44fb5853cce6a70434b80.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/xevofolokawalix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/92595322990.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/fallout_2_create_character_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/mezamujupego.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/aarakocra_dnd_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/vefew.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/54648096255.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/ansi_c_programming_by_balaguruswamy.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/underwater_acoustics.pdf
    • https://static.usrfiles.com/ugd/565485_fdb07c8f2d5d424dbfe17275563ae448.pdf
    • https://static.usrfiles.com/ugd/b8c837_52ff2c85e9de477b9af5bb7df03e88b6.pdf
    • https://static.usrfiles.com/ugd/93c935_dc1dc4781b444be3aa541277aace12b1.pdf
    • https://static.usrfiles.com/ugd/003b86_5302b1c2e2bf41e1b7fb458c716aada1.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_off00006a08.bin
796dcd14aaa9c5a8781827d075062b49aedc5083fc91aefcb947501735e04b7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 5412 bytes
font_01_sfnt_off00007c5c.bin
6e6bb94cc295c0ab43ebdc20819d355f656b977a6b9050867a08734550bfc956
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5C 10808 bytes