Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7b2365ff4e27c…

MALICIOUS

PDF

34.4 KB Created: 2020-08-15 20:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05364df357c3150b1520834294706b29 SHA-1: 977b6e9f7fafda0c857464d09cb86866215bc1c9 SHA-256: fbb7b2365ff4e27c58fe18d21bf3d1613ca6369b20735ba8b6c1f07645588eb1
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=berlitz+english+business+1+pdf`. The heuristic firings indicate this PDF is designed as a link farm, likely to obscure the final malicious destination and potentially engage in SEO poisoning to lure victims. The ML classifier strongly supports the malicious nature of this document.

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=berlitz+english+business+1+pdf
    • http://files.colortrendzsalon.com/uploads/1/3/0/7/130740257/4543987.pdf
    • http://files.asteriayoga.com/uploads/1/3/1/3/131379540/4420325.pdf
    • http://xupak.musicmastertraining.com/uploads/1/3/1/8/131856271/698476.pdf
    • http://files.egvbikes.org/uploads/1/3/2/7/132710795/e8b42fc80fde806.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/bivazanaju.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/absorcion_atomica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/zasokafofuwigij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9001/7430/files/hb_electrophoresis_report_time.pdf
    • https://cdn.shopify.com/s/files/1/0430/6613/0593/files/xegagojububo.pdf
    • https://cdn.shopify.com/s/files/1/0451/7701/2373/files/biopsychosocial_assessment_dsm_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/detonilagoziwumafuzad.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/4284466449.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/multivariate_statistical_methods_a_primer_manly.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/dobelo.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_off000045ca.bin
ed696399943466bf86b232b50e279cfa164cb8cb066b38dadb4bdbcb63e74d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45CA 5384 bytes
font_01_sfnt_off00005821.bin
1ae60be9fc972f5d366e302b1ceef1805e1ce927116fc77b540a7e0d7c67e5e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5821 10688 bytes

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