Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90f191c8ebed7fc…

MALICIOUS

PDF

59.6 KB Created: 2020-09-30 03:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031b30afd68afdfce556e63630bd31c1 SHA-1: 96d879c49381f5e169f8b223661e6302596f90d5 SHA-256: a90f191c8ebed7fcd5f7bd77b455d06828c9a3b497325d958f0289796cfe37ea
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body, though partially corrupted, suggests a lure related to 'Class 9 biology notes in hindi pdf', aiming to trick users into clicking on the embedded malicious URLs. The ML classifier strongly indicates malicious intent.

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://ggtraff.ru/mozel?keyword=class+9+biology+notes+in+hindi+pdf
    • http://dadus.hnossa.com/uploads/1/3/0/7/130776795/zujuw.pdf
    • http://fibuk.efungpstours.com/uploads/1/3/0/8/130814575/165030.pdf
    • http://files.karuewachiraphotography.com/uploads/1/3/1/6/131606046/dekojalojuje-votux.pdf
    • http://rebejufa.cindyskombucha.com/uploads/1/3/1/6/131606279/8139640.pdf
    • http://levono.mydesignsbypamela.com/uploads/1/3/2/3/132303054/muxikagepeto-xefunudofon-mopotuso-mupokoweguvug.pdf
    • http://wojiw.namastebh.com/uploads/1/3/2/6/132681382/bf532bf565.pdf
    • http://files.cartilagehelp.com/uploads/1/3/1/4/131452741/921914.pdf
    • https://uploads.strikinglycdn.com/files/9ae965f0-1602-4b18-8a7a-ce5cb870f764/22513180371.pdf
    • https://uploads.strikinglycdn.com/files/20c1fc88-5350-4971-8e6c-6924ef7f227d/pizadenani.pdf
    • https://uploads.strikinglycdn.com/files/bd04fddd-9d02-4a4f-b434-2bd56944a0c3/besinugiviwebefamuta.pdf
    • https://uploads.strikinglycdn.com/files/1ab779d5-1dd4-4550-838a-1ec714c4300e/vuxopabokuku.pdf
    • https://uploads.strikinglycdn.com/files/f0ce2430-7f38-4b10-8234-c916f50453cb/48928701789.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006930.bin
3d0db62a219180801bfc6cb747692dcddf86a2cb9bda0255a19c9cbe3844da04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6930 5416 bytes
font_01_sfnt_off00007b91.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B91 3720 bytes
font_02_sfnt_off000086f4.bin
be72c19bf67dbc8309ef65a8e578a38d10a9ee833d4b55039cdefdd4d270950f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 10020 bytes
font_03_sfnt_off0000a94c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA94C 4324 bytes
font_04_sfnt_off0000b74e.bin
9675944187e3588f19a4d757e7e5c1ce4817dc239218039c136a6ec2df7e2fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74E 13684 bytes

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