Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aef2f68495fc999…

MALICIOUS

PDF

102.1 KB Created: 2020-09-06 10:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7529c6f4be254ca9b0ef0ea03dfe138 SHA-1: 673cab0f940dd8d699f6ce0fdc475e111cd73d3a SHA-256: 4aef2f68495fc9994fa7bb75828c8c55eaba65302609489424320d7608d32f76
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a redirector link pointing to ttraff.com, which is associated with malicious activity. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute content through a large number of seemingly benign PDFs. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=tchaikovsky+nutcracker+piano+pdf
    • https://static.usrfiles.com/ugd/c068f8_5dae2833d17c46b0a99846542c0bdc7a.pdf
    • https://static.usrfiles.com/ugd/4b874d_bf0eb2b4a9b04a9d9cc49a11e0b13007.pdf
    • https://static.usrfiles.com/ugd/b8c837_c558f0fe94124d7e8cb83514f51fbdba.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_e59cc1e9c353473cbf3f697998af4d7d.pdf
    • https://static.usrfiles.com/ugd/430cb2_8afe04a26ca6474a97d50dccb598f4ff.pdf
    • https://static.usrfiles.com/ugd/37321e_1ff86d87289c496d93d5a772c7b3d715.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_395af9054bcb461892407d299e624c9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f9d7878fc5d424aa2ad22b1841f14e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3ecb5f568d348a5bf67f3a8bbd591df.pdf
    • https://static.usrfiles.com/ugd/33a2e4_e57ad61eb70c4162895bb8afdfb1a4e8.pdf
    • https://static.usrfiles.com/ugd/98e298_ffd4fc7d9f18417da8b9b2cc3e608b8c.pdf
    • https://static.usrfiles.com/ugd/bdc04d_78004183cfd84a29b3cc2dcf2ad47606.pdf
    • https://static.usrfiles.com/ugd/7ad284_f64214927b0447fc92d575f262339bc6.pdf
    • https://static.usrfiles.com/ugd/b80405_77903eb9b5264a45bd404fc8bfbd2c4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7450f0a71b8442cc90548803a306cbe0.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_off0001341d.bin
4188df70adcd96cb2523dce71268d891d51782baf19a98a95a6909be4efb1b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 5384 bytes
font_01_sfnt_off00014676.bin
34517462c8fe777f56158773a7cd4d0cd704c264ff87745cab37cdbd4ea2e6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14676 15184 bytes
font_02_sfnt_off000175ea.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175EA 16120 bytes

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