Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc1d14763a2eb6b…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 01:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a932014cf3e1213f934e24c456a3a3 SHA-1: 8ecad715db4c751d3c8224b1b9c295f3e7459914 SHA-256: edc1d14763a2eb6bef496365839723c66d4560c742bd92f37d8dd9c5dd2471e9
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=vanderbilt+kronos+timesheet, which is likely the primary malicious payload delivery mechanism. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, suggesting a broad distribution or SEO-poisoning tactic.

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.cc/wix?keyword=vanderbilt+kronos+timesheet
    • https://static.usrfiles.com/ugd/c836c3_9a765eae545c451fac78a597dd073fe1.pdf
    • https://static.usrfiles.com/ugd/67e251_592e001739384790a04e99be6593c8fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_903ed052b9164704967317d2aaf1eb30.pdf
    • https://static.usrfiles.com/ugd/93c935_f4c6ae5dee8e4c998ec565aab1d3bce5.pdf
    • https://static.usrfiles.com/ugd/b8c837_66def0301fec4b8982a9bcd60fb46537.pdf
    • https://static.usrfiles.com/ugd/5438e3_e4575bb629eb4e6fa62dab59cd7ee96e.pdf
    • https://static.usrfiles.com/ugd/b8c837_249d48c19f4e44d79ddff24efe81c97d.pdf
    • https://static.usrfiles.com/ugd/29c71c_ef678d4668164b36bfe3396b0b315c95.pdf
    • https://static.usrfiles.com/ugd/c63dba_c69038e7250d4193a1014d8870aa54fe.pdf
    • https://static.usrfiles.com/ugd/735189_2b5c72ba5b964f70b8041344ee111293.pdf
    • https://static.usrfiles.com/ugd/7c3584_36e00b04b2324119909854f1ebdf1ded.pdf
    • https://static.usrfiles.com/ugd/4f270c_cb07f059bda040b0a1be9225cc9e0f6f.pdf
    • https://static.usrfiles.com/ugd/4b7290_a1ecbffbff854f43857d6c3ed976e35a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad46709eed94c46926a22702f232f21.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_14f0d53b2b824172a17d0d3c05f7c278.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_off00006f42.bin
1e95539a0c172ca9a78c3b0705a732ab14d8b008a9f690b274db9d47f31d6425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 5020 bytes
font_01_sfnt_off00008014.bin
c5c67fcb353de51d1d592bba97ec87de08b4c3b63774d617b94a886b6cbe9cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8014 9908 bytes
font_02_sfnt_off0000a1f9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F9 4324 bytes

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