Malicious PDF — malware analysis report

Static analysis result for SHA-256 423dd7137b97ef83…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 20:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca75257356592a31c760211741fd18c3 SHA-1: dac351885d370717874760d492ee3a58857d9c65 SHA-256: 423dd7137b97ef83bc132e2756e4077910675d868ea2640852a6ebfde6efdbe1
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a workout PDF. The document also features a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.ru/wix?keyword=turbulence+training+workout+pdf
    • https://static.usrfiles.com/ugd/eb6612_1ee0db8917b24820b007d8e2b0317a91.pdf
    • https://static.usrfiles.com/ugd/d78803_340219e700c54adcb596ba1f9d8a4af8.pdf
    • https://static.usrfiles.com/ugd/07625c_582b116a8c6640e8b7e53512ca586cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9789c00d347f4b03877ef1bc5c59f908.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/rirebisutagikawubalov.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2c4bba5127a4c2b93fd32c817457492.pdf
    • https://static.usrfiles.com/ugd/b8c837_70aab77c964e476e9511c4ec3e788ad6.pdf
    • https://static.usrfiles.com/ugd/87a178_ffd13bbec7274e0782ff11c8f6d41546.pdf
    • https://static.usrfiles.com/ugd/d01287_fcd0adf7d16346bb9d11c7d4300060cf.pdf
    • https://static.usrfiles.com/ugd/e32576_eca6c5d49f364a49ac208b8ccb3b171f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e0003f6df384570a96f39d9c6e2e33e.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_off00006163.bin
8a050b7b8be5fce986b7c0a29021a92bf030a4bedadfdac149f1ed9346523fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5388 bytes
font_01_sfnt_off000073d9.bin
dde87eea11af36604258ccfe644cfc298ecd40e2a8a7d0b92193367af9ab937b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 10068 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.