Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d12eebb7fc16a4…

MALICIOUS

PDF

51.9 KB Created: 2020-08-21 08:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace4f94719ebf65ed65cd868a654512e SHA-1: 460efa97b1238f02611e8a9d07a93b71649fd6bf SHA-256: b8d12eebb7fc16a4b4e9103c3be58ee889fd709f1b0154cc6f31fd1cdd352c49
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a "Canto ostinato sheet music pdf" download. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier 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/pify?keyword=canto+ostinato+sheet+music+pdf
    • http://files.haarlowshoopsacademy.com/uploads/1/3/0/9/130969712/b12f1288585.pdf
    • http://files.parishofhoylandsaintandrew.com/uploads/1/3/1/4/131438741/xivajesenam_kizagowo_poniwonaluwiw.pdf
    • http://rilusa.aahsanguilla.com/uploads/1/3/1/4/131407592/8354997.pdf
    • http://tewudolig.hollygrovebands.com/uploads/1/3/0/7/130775162/fdb196fb6b1cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2357/files/58866000789.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/8996100282.pdf
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/61806772554.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/66561633758.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/veponiden.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/welipowuxobivunetivukegad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2569/3845/files/rimalofit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/calvin_and_hobbes_comics_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5047/files/61231335931.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/weekend_of_a_champion.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/78408092492.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_off0000728c.bin
33f491335eb90128f581b214acff88e33709bd021cff3b7fc3d1a1886bdedbf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 5172 bytes
font_01_sfnt_off000083ff.bin
e475ae4fe1cf4897258909e7442bd41c2c68c02ecef566bffb15996cfeaf5bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 12880 bytes
font_02_sfnt_off0000ad15.bin
b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD15 16100 bytes

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