Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f0bb4557b9a420…

MALICIOUS

PDF

43.2 KB Created: 2020-09-01 21:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9948cda8940f312d49722aadac42f1c SHA-1: c7f4f118e69c5da1386a3966eeb7bdaeceed1c68 SHA-256: f5f0bb4557b9a42068aba80ca0405d269dc172069d5a445e517327f5511dee9e
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with 24 links pointing to various PDF files. One of these links, https://ttraff.ru/wix?keyword=postknight+guide+stats, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL and references to 'postknight guide stats', suggesting a lure.

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=postknight+guide+stats
    • https://static.usrfiles.com/ugd/db1da1_c353c5af039d4d419a3df9bb9436a921.pdf
    • https://static.usrfiles.com/ugd/69695d_b9f62e64a53949b48d3e6eee7903b11f.pdf
    • https://static.usrfiles.com/ugd/6df952_2f6f96c529ed41388f3fc100cb7017f1.pdf
    • https://static.usrfiles.com/ugd/8127dd_3d6e2f905ce2467291b9be09613b1920.pdf
    • https://cdn.shopify.com/s/files/1/0435/0964/5478/files/leave_request_format.pdf
    • https://static.usrfiles.com/ugd/b8c837_e847a8f80fd549a3a5b5a5386cd21c87.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a9a602e43c4a968887a957642c7d41.pdf
    • https://static.usrfiles.com/ugd/70c1f8_882fcb5ef099481ab9fa12699ccc0b53.pdf
    • https://static.usrfiles.com/ugd/0779a3_83d71ed0110c4085868ece219a16b9dd.pdf
    • https://static.usrfiles.com/ugd/105a8c_c9f8fde5b5114ac79ba6a70c8c67eba5.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_e43751a09a6849aa8ea31a32370754a2.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_604f5848875044d4b4e850e96c00d05c.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_off00005e49.bin
ac1a8e48c0cae3c42fa919f33688beab477b3d729fe7c76accba78c20b67fd9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E49 4904 bytes
font_01_sfnt_off00006eee.bin
f3399a1c11b0ba07fe0d09148c34ecf86b8378d6b7961a1e9aa2f589dbda47ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEE 10336 bytes
font_02_sfnt_off0000923a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923A 4324 bytes

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