Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc8f97cb4cc1387…

MALICIOUS

PDF

48.9 KB Created: 2020-07-08 16:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e628d49d039652911c32711dfe58e52 SHA-1: 098b1ca12761dedd6659a8524150c93cbee0933e SHA-256: 9fc8f97cb4cc13879daf45914f8db28731201e070794643d8307855b3d402fd7
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to ttraff.ru and a large number of links to external PDF files hosted on various domains, indicative of an SEO link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the title 'Using inequality signs worksheet' and the malicious URLs, suggesting a lure to drive traffic to potentially malicious or phishing content.

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/wb?keyword=using%20inequality%20signs%20worksheet
    • http://files.authorrebeccaarogers.com/uploads/1/3/1/6/131637034/wakobobo_jujorufaxeso_puxul.pdf
    • http://files.psychometricdynamics.com/uploads/1/3/1/0/131070116/9284285.pdf
    • http://files.jessicaraeanderson.com/uploads/1/3/1/0/131070379/9611647.pdf
    • http://files.suncoastsoul.com/uploads/1/3/1/3/131379612/baretanemomimu.pdf
    • http://files.bodyshapeaesthetics.com/uploads/1/3/0/7/130739780/gofevab_xemamebirelagek.pdf
    • http://files.unlawfullytasty.com/uploads/1/3/1/3/131379951/taxujuniwiwup-dijefumuwepu.pdf
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • https://xevesir.files.wordpress.com/2020/07/34958209719.pdf
    • https://wikemifap.files.wordpress.com/2020/07/89078806211.pdf
    • https://movulimisulu.files.wordpress.com/2020/07/29795455472.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_off00007464.bin
c1f4102451fbf75e6ff47443449515f391fdab7ad2b7657fb488f87a06f8cac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 5204 bytes
font_01_sfnt_off00008618.bin
3915bf9c14e4d3f0dc172b2c9db1a43fe76b0a98eb4438c00b1c5c3e4182f321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8618 15124 bytes

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