Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f3a12f5ee01b59…

MALICIOUS

PDF

38.5 KB Created: 2020-08-28 22:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0743085abe21c860b1782affa465690d SHA-1: 00312f84f4c4af9eb7b6bba360ef1865389ee626 SHA-256: 21f3a12f5ee01b59586fcff64a0cc6fee196893d77447e29cba0fdb290701ddf
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm and a redirector to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. The primary malicious URL identified is ttraff.ru, which is likely used to redirect users to further malicious sites. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the malicious intent.

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=nth+roots+and+rational+exponents+wor
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/skyrim_update_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9187/files/free_solitaire_games_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/1445422411.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1575/files/lerivisuxalire.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1537bbddb36496ba8d58b19bf8e11e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef403b0c606d477e9fae24e17ab10a88.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf9afa210ccd4576ace0f8eb31f8251d.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/i_want_you_savage_garden_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pezudatilekubad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0498/files/98302802827.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/upsc_blank_answer_sheet_format_vision.pdf
    • https://static.usrfiles.com/ugd/b8c837_85610b545a39410487a610b3e7dfc8c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e17141cec84f3680680dc50bba2ba8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8de1a510741490685f51a983956bd75.pdf
    • https://static.usrfiles.com/ugd/b8c837_c970f4ca78c74065a324323e999182f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_15f594087dc04933bad9918a5812b228.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_off0000573d.bin
24b5fc42b958a1d88d4c2c15e5cd661ace9c9def97f4faac39e5284f4f7214ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x573D 5176 bytes
font_01_sfnt_off000068e2.bin
8e8f15e774e02a2d5c0f56d7422fd007bc921e7cf0b1612eefbca0a87c5d0677
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E2 10620 bytes