Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a6a13e3e4b0a21…

MALICIOUS

PDF

43.9 KB Created: 2020-08-04 09:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a330083a9d8c09137da72b00ed842c44 SHA-1: 726b432edee947d2e3fab5289887dd9b560ee20c SHA-256: a2a6a13e3e4b0a21140bf1a8395a1f28673635119a82c4b31a18c382293179a8
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.com, which is disguised as a document about anesthesia. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs hosted on various domains, including Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive document, leading users to malicious infrastructure.

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.com/pify?keyword=local+and+general+anesthesia+pdf
    • http://files.tampagolfgroup.com/uploads/1/3/0/9/130969992/d45abb010abf61.pdf
    • http://files.css-el.com/uploads/1/3/1/3/131380934/jerilimofalemo.pdf
    • http://files.justwrite15.com/uploads/1/3/1/3/131384599/bavamademo-nugoxapiwojalav-gekizepifononug.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/73310588644.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/lefugogakapegiguwuxomovax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/76892240991.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/80777049326.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/54942070972.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/23324288144.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/73536264367.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/cch_chuyn_file_thnh_nh.pdf
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/zezapojogakunufilikub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/mesuzodekuwosarosof.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/rugatutagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/35488929096.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_off00006cdf.bin
0cf30b8fd55772b4c19d245bf678e6828527370ee91e3785dc7d5b9a1eb096b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDF 5360 bytes
font_01_sfnt_off00007f1a.bin
e37e16a87edee848d45b468cbc20e2b9508d933b982f33632c3bb282feea4a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 11040 bytes

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