Malicious PDF — malware analysis report

Static analysis result for SHA-256 2878b1d3f80efda1…

MALICIOUS

PDF

37.2 KB Created: 2020-08-31 07:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd0ed72b3caaddcbe76da32925a983f7 SHA-1: 902cf27ca7578edef267d692326a5dc2e378704b SHA-256: 2878b1d3f80efda17fb3233454ba5998865009b1cdde0729bdd66931fca83cbe
150 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 with a keyword related to unblocked games. This suggests a social engineering tactic to drive traffic to malicious infrastructure. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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=tunnel+rush+unblocked+games
    • https://static.usrfiles.com/ugd/162fe6_dc7c96d42bad48c2a17d1e36ea999254.pdf
    • https://static.usrfiles.com/ugd/ea2f88_b00978897c3d4018a9b70c86786e8134.pdf
    • https://static.usrfiles.com/ugd/625844_a1b06a6ce9db4e2aaf27c7a040e3770c.pdf
    • https://static.usrfiles.com/ugd/9a242c_94dde9aef4c84c1dbec11b87f882af4a.pdf
    • https://static.usrfiles.com/ugd/856cea_ce81ecc3411248438cc20524816a7c19.pdf
    • https://static.usrfiles.com/ugd/88a84f_a5a408e46b2444e49646ba15407350fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e03fbc2826624aef8dd0d6211dca4743.pdf
    • https://static.usrfiles.com/ugd/fe83c3_7b4decca64ad444ca95e1f9d6c8157db.pdf
    • https://static.usrfiles.com/ugd/1f6d71_16e506b4d0b54e4882137be78420e914.pdf
    • https://static.usrfiles.com/ugd/b8c837_46b32d07ec3e45069c3b580ba210aef5.pdf
    • https://static.usrfiles.com/ugd/2c8d66_cff10fdabd484e5ab4ff8207c22a6394.pdf
    • https://static.usrfiles.com/ugd/217d68_b3c5134d1a9d4453b6b61798bc44e61d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f45e0c67bf6d4144944e76151606cdb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b0b0bfba6b743bebedf975decc995d1.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_off00005297.bin
ca6e404e2de4523ec753495233379aa5ccf566c8839fc370de460dae2b51b94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5297 5504 bytes
font_01_sfnt_off00006512.bin
519e795ac82c279c5c14fcacb1b15c5622103d53be929dcd83f04da06757eac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 10588 bytes

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