Malicious PDF — malware analysis report

Static analysis result for SHA-256 23494d09c9767244…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 21:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0433ba9bdcad443972f584ad79bbe71b SHA-1: 9e26f534d83ecb91e19debf17621480bed943d81 SHA-256: 23494d09c976724442f956db9820e9a048edd77db138ee27bd96b3b45089de54
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts. The document body, though heavily corrupted, contains the same URL and references 'sheet music', 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.cc/wix?keyword=oltremare+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_cc2ca64bcc87477fb5d65930b045d250.pdf
    • https://static.usrfiles.com/ugd/4dd980_522dd3d5cfb64fbd9cfa2cd063035fe5.pdf
    • https://static.usrfiles.com/ugd/83b1b3_1198bf5de3fb48f386780082705eb9ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee9db509fe3b41b8b98ae1688667e26e.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_015b83cbd753419d9c09a0be9d276ac8.pdf
    • https://static.usrfiles.com/ugd/f09a9d_509d031c42b443ffa930bfa5914c2dc5.pdf
    • https://static.usrfiles.com/ugd/585b1d_e46a5377e47b4d6687853cae8c4cb70a.pdf
    • https://static.usrfiles.com/ugd/b8c837_52cc22bbb8c04c398fb28627c88c81bb.pdf
    • https://static.usrfiles.com/ugd/f0e51d_ad59470b2e674dc3959d665ea3b0cc10.pdf
    • https://static.usrfiles.com/ugd/09273f_bfd7c9851ce9499a8d923f38d7ad8f2a.pdf
    • https://static.usrfiles.com/ugd/fd3290_0e2f59fdb70f4d2e880916695f4ee63e.pdf
    • https://static.usrfiles.com/ugd/b8c837_30a319ecbfb8443d8351d97a3c243ee1.pdf
    • https://static.usrfiles.com/ugd/5b9a87_07b2e9e9210f4238899d7c7b8f7da229.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7472894cf8c4921895d0f1fdb15bfad.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_off00005310.bin
9026226dcefe0deb93307781a215a4379730a7d3ecfbaa6c1fb3666fb45abbed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5310 4732 bytes
font_01_sfnt_off0000631c.bin
767ccff627b27b2ece0127cb9c2940198009407f34076ca57cbdb8bc9203dd6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 14392 bytes
font_02_sfnt_off00009096.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9096 4324 bytes

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