Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6351247ef3ae17…

MALICIOUS

PDF

33.0 KB Created: 2020-09-12 17:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbdf71d60d353dc29bbae76df9707476 SHA-1: 018d06bc6511ae76103bacf605aa9a986912ee6f SHA-256: ef6351247ef3ae17be3dc0bdfd2b7924aa5b266eec68531ff055423e446102fd
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.me/wix?keyword=bendito+dios+lldm+pdf'. Additionally, it exhibits a PDF link farm, with numerous links to PDFs hosted on 'static.usrfiles.com'. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but includes the malicious URL and several benign URLs, suggesting a lure to external content.

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.me/wix?keyword=bendito+dios+lldm+pdf
    • https://static.usrfiles.com/ugd/bcd086_812be8de6bc74914bc6e90185d78a982.pdf
    • https://static.usrfiles.com/ugd/cd1d52_19e7747d00ff4b74991b6cd23c2a38e6.pdf
    • https://static.usrfiles.com/ugd/145364_d2bf00e533f745879e1f79b6f047bd05.pdf
    • https://static.usrfiles.com/ugd/d94ae5_6c35490fb76c48899aee9879a65abff8.pdf
    • https://static.usrfiles.com/ugd/b8c837_acbe67c5670a45ecb7dbe5837abaf431.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e9311577864e40c9b4585db32002c61b.pdf
    • https://static.usrfiles.com/ugd/aec2ea_11c108d2c3774629bf143aeecfb63e22.pdf
    • https://static.usrfiles.com/ugd/37428b_c546012415e64f5f8580bb9d1807e15e.pdf
    • https://static.usrfiles.com/ugd/062c90_05240c0551c54caea4058b2819c1e503.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_72183740f16844e2b39e346c135c2e90.pdf
    • https://cdn.shopify.com/s/files/1/0438/4092/9957/files/basic_conversation_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/equations_with_variables_on_both_sides_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/zijafiginimafuribuvafab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/thinking_in_java_pl.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/45914916907.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_off000045fa.bin
8d25a72968f27536d69d4ec00b533ea69d1f38b022a56c024df58c9f1c3c3d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45FA 4932 bytes
font_01_sfnt_off000056b6.bin
92b4b76cdce63e73b30660ba5d39980bb9a4b461e755b8f6f5b66bb32c6491e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B6 9568 bytes

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